Disclaimer: I do not own the characters of Avatar the Last Airbender or the Avengers (MCU), only the story. Avatar the Last Airbender and its characters belongs to Nickelodeon and Avengers belongs to Marvel. I apologize for any errors in grammar and/or if I was not accurate in reference to something.

A/N: And here is the second part of Siege of the North. I'm going to make sure that there's enough of Avenger action along in it, but hopefully I can do it right. And I do apologize for the long flashbacks, but I did feel that they were necessary and they're in the order of the previous episodes.

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Katara: Water, Soldier, Mechanist, God, Earth, Fire, Spy, Archer, Monster, Air

(One by one, eight figures do something to show off their skills: the waterbender weaves a stream of water from the ground, around him and then thrusts it towards the side, the soldier blocks an attack with his shield before throwing it, the mechanist has armor envelope him and then uses the repulsor on his hand to blast something on the side, the god holds a powerful hammer high to summon a bolt of lightning, the earthbender kicks the ground bringing up a large rock before he kicks it away, the firebender twists around as she summons fire from her foot before doing a high kick to the ground and makes the flames spread, the spy drops down from above and displays a few moves, the archer rolls across the ground and fires a few arrows, and finally the monster comes down from a jump and smashes his huge fists on the ground, the airbender drops down and then with a circle of his arms he creates a blast of wind.)

Katara: Long ago, the four nations lived together in harmony. Then everything changed when the Fire Nation attacked.

(Docked on a shore, five Fire Nation ships with the Hydra insignia released their soldiers. With a jump forward and a palm thrust, the firebenders released a wave of fire as the Hydra soldiers used their advanced technology.)

Katara: Only the Avatar, master of all four elements could stop them. But when the world needed him most, he vanished.

(The Avatar, a man with a crown on his head and dressed in robes stands on a pillar of stone as he bent the four elements of water, earth, fire and air to show his skill in the arts of bending. After releasing a powerful disk of wind, he disappears from existence.)

Katara: A hundred years passed and my brother and I discovered the new Avatar: an Airbender named Aang and met the team called the Avengers.

(The water tribe siblings find a young Airbender frozen in block of ice. After freeing him, they are then joined by heroes called Captain America, Ironman, Thor, Hulk, Clint, and Natasha.)

Katara: And although with the teams help and his airbending skills are great, hehas a lot to learn before he's ready to save anyone.

(At an Air Nomad path, Aang creates an air scooter and starts to have fun with it. But when he expands his circle a little bit, he runs right into a statue. He rolls over onto his back as all six of the Avengers then poke their heads from behind the statue to check on him.)

Katara: But I believe the Avengers and Aang can save the world.

(Aang, Steve, Katara, Tony, Thor, Bruce, Sokka, Clint and Natasha stand side by side, looking down at the world on a mountain's peak for a moment as the reader's view is turned upwards to the sun.)

Nickelodeon and Marvel

The Avenging Avatar

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Avatar Roku: Previously, on Avenging Avatar…

Now longer angry, Haybi reverted to his true form of the giant black and white panda as he turned to walk out of the village.

Avatar Roku said, "The solstice is ending. We must go our separate ways…" Then he made it sound cryptic, "for now."

Aang thought about when he truly needed Roku and then said, "But I won't be able to come back to the temple. What if I have questions? How will I talk to you?"

"I am a part of you." Avatar Roku said, thinking of how they are connected in the Avatar cycle. He then told him, "When you need to talk to me again, you will find a way."

The Red Skull looked to the Colonel and said, "I am giving you at least forty Hydra soldiers. The rest will need to be taken to other locations along the Earth Kingdom."

"It seems I've been promoted to Admiral." Zhao said with interest as he read a scroll from Fire Lord Ozai. Looking back to the colonel he had a smirk as he said, "My request is now an order."

Natasha looked to Aang and Steve before she asked, "How many Hydra soldiers were there with the archers?"

"Only a small group." Aang recalled. He then remembered, "We didn't get an exact number at the time. But there were a lot more of them when we had been captured and held prisoner by Zhao."

"There it is!" An excited Aang shouted as they neared the Northern Water Tribe.

"In our tribe, it is forbidden for women to learn waterbending." Master Pakku sternly reveals. Katara looked to the old man with trembling eyes as she was infuriated by the news.

After a quick fight between them, Master Pakku looks down to see Katara's necklace lying there. Picking it up, memories flooded back to him as he said, "This is my necklace."

After gaining a newfound bond with Master Pakku, Aang and Katara both had smiles as they started to learn under waterbending Master Pakku.

"And you are sure that you have seen many soldiers from Hydra." Thor asks his friends. Natasha nods and said, "It seems like Hydra's nearing completion of their teleportation machine."

"Which means that they'll be bringing their war machines to this world soon." Steve added.

"I assume that you have everything ready?" Johann Schmidt asks Admiral Zhao as the fleet starts the launch. Zhao nods and says, "My fleet is ready."

"Then I will be taking my leave." The Red Skull informs before vanishing into a portal. Both General Iroh and the Winter Soldier stand behind Zhao as orders, "Set a course for the Northern Water Tribe."

Drifting behind the main flagship, many other Fire Navy ships followed after to begin the invasion.

Master Pakku walked over to his first female pupil and acknowledged, "Katara, you've advanced more quickly than any student I've ever trained." Katara smiled as he complemented, "You have proven that with fierce determination, passion and hard work, you can accomplish anything."

It was then that they noticed black flakes started to fall with the regular snow. Pointing to the black flecks he said, "Hey, look."

"What's happening?" Princess Yue asked in confusion while lots of it started to rain down. Memories, bad ones, ran through Sokka's head as he remembered, "Oh, no."

"This will truly be one for the history books, my friends." Zhao seemed both confident and a little smug of his plans as he said, "Just think, centuries from now people will study the great Admiral Zhao, who destroyed the last of the Water Tribe civilization."

Iroh then turned to the Firebender and said, "We'll be landing soon. Do you have a plan?"

The Winter Soldier said, "I apologize that you'll be going on the hunt for the Avatar alone."

"You have your mission, and I have mine." Prince Zuko said and placed the mask back into place.

Chief Arnook moved between Princess Yue and Master Pakku. He then addressed everyone, "The day we have feared for so long has arrived." The chief delivered the bad news, "The Fire Nation and their allies of Hydra are on our doorstep."

"I wasn't there when the Fire Nation attacked my people." Aang said as he regretted not being there for them. He sounded determined when he said, "I'm gonna make a difference this time."

Aang ran up to the last catapult and picked up a hammer. Looking at the tool/weapon in his hand and said to himself, "I hope Thor doesn't think ill of me when I do this."

All of their eyes grew wide at the sight of so many Fire Nation ships, no doubt carrying an enormous amount of soldiers of both Fire Nation and Hydra. Aang sounded really worried as he said, "You've got to be kidding me."

He walked away while Hahn brushed some hair back before looking to a surprised Sokka. Pointing a finger at him, Sokka questioned, "Princess Yue is marrying you?"

General Iroh came up behind him and advised, "It's almost twilight, Admiral. As your military consultant, I must advise you to halt your attack."

The admiral looked back as Iroh then informed, "The Waterbenders draw their power from the moon, and it is nearly full tonight."

"Oh, I'm well aware of the moon problem." Zhao said as he turned back to look out the window. Then he assured them by mysteriously saying, "And I am working on a solution." He decided to humor them, "But for now, daybreak it is."

"I'm not sure. I'm completely stumped about this battle." Aang said as he leaned against Appa's leg. This seemed to affect Princess Yue as she said, "But you're the Avatar."

"I'm just one kid." Aang said as he hugged his knees and hid his face. Both Katara and Natasha kneeled down to him to comfort the boy.

General Iroh then said, "I'm sorry." Then he gave the reason, "I just nag you because," he was on the verge of tears as he said, "well, ever since I lost my son…"

The Winter Soldier looked to the general and said, "Let's get back before we're missed."

Chief Arnook came in between the two and said, "That's enough!" Turning to Sokka he said, "Sokka! You're off the mission."

Steve then said, "I heard most of that."

"About how much?" Sokka asked, a little nervous. Steve then said, "Mostly the part how a certain princess didn't deserve a weasel." Taking a step closer he said, "And I hope you remember what we talked about at the war meeting."

"And I do." Sokka reassured. Then he explained, "I joined the special mission because I wanted to help out." Pointing to the departing men he said, "That was for Princess Yue, Hahn's not in it because he likes her, he's mostly marrying her for the perks of it."

Removing the mask from his mouth, Prince Zuko then took a deep breath of air. Then with a determined look, Prince Zuko jumped into the hole and swam to see where it would lead.

"We need to inform Chief Arnook about what's coming." Thor told him. The sound of footsteps caused them to look back through one of the doors.

General Iroh and the Winter Soldier sat across the table and waited for what the admiral had to say. Admiral Zhao then said, "I've just gotten a message from Johann Schmidt. He wants the Winter Soldier to go with the landing party when the ships reach the wall."

Iroh looked to him and said, "I sense a change in you. You are not the same person when you were assigned to us. I can tell that you are much more than what you appear."

"Thank you, General Iroh." The Winter Soldier said with a respectful bow. General Iroh then said, "Hopefully, after this battle, we will continue our journey together."

"I hope so." The super assassin said.

Princess Yue looked to the moon and said, "The legends say that the moon was the very first Waterbender. Our ancestors saw how it would push and pull the tides, and learned how to do it themselves."

"I can see how that works." Natasha nodded. Katara then added, "I've always noticed how my waterbending is stronger at night."

"Our strength comes from the spirit of the moon." Yue said as she looked up at the orb in the sky again. Natasha then asked, "And I guess that strength grows when the moon is getting closer to full and weaker when it's almost a new."

Princess Yue nodded to this. Then she added, "And our life comes from the spirit of the ocean. They work together to keep the balance."

Her words got Aang thinking and his eyes widened. Then with a smile he said, "The spirits." Then standing up and looking up to the moon he said, "Maybe I can find them and get their help."

Katara then explained, "The Avatar is the bridge between our world and the spirit world."

"Plus, he's been there before." Natasha added with a nod. Katara remembered before saying, "Aang could try to talk to them."

"Maybe they'll give you the wisdom to win this battle." Princess Yue said with much hope. But Aang then threw in his own idea, "Or maybe they'll unleash a crazy, amazing spirit attack on the Fire Nation."

He looked between all three women to see that they did not have amused faces. Aang then assumed the first thing as he leaned against the railing, "Or wisdom. That's pretty good too."

Katara then asked, "How are you going to get there this time?"

"I have an idea." Princess Yue said, making them all look to her. Then with a motion of her hand she said, "Follow me."

Sitting down at the edge of the pond, Aang started to prepare himself for the journey. Sitting with his legs crossed he then placed his fists together and closed his eyes to start meditating.

Back in the weapon's room, Chief Arnook came before the three and asked, "There is something I need to ask of you." Looking to Thor and Steve he asked, "I ask that you be on the front lines should the Fire Nation and Hydra be able to land on our shores."

"You can count on us, sir." Steve nodded. Thor added to it and said, "We shall give them a fight like they've never seen before."

Chief Arnook smiled in appreciation to this. Then looking to Sokka he asked, "I didn't pull you off the mission regarding what happened earlier, but also for a more selfish reason."

This surprised Steve and Sokka, mostly the latter. Chief Arnook then said, "I have an equal special task in mind for you."

"What you want me to scrub the barracks." Sokka said, mostly joking. Steve groaned and Sokka stood at attention. Sokka listened closely as the chief said, "I want you to guard my daughter, Princess Yue."

Sokka asked, "So are you gonna search for Bucky while fighting, Steve?"

"Your friend?" Thor asked the super soldier. Steve nodded and said, "Yeah. If the roles were reversed, he'd do the same for me."

"Are you sure?" Sokka asked, not fully convinced. Again, Steve nodded and confirmed it, "Thor and I will help the Waterbenders deal with the army, but when a chance presents itself, I'm going after him."

"Then I wish you luck." Thor said in support of his friend.

Prince Zuko panted from the exertion and used another fire breath to warm himself.

Looking up into the sky he said, "Now for the hard part."

Princess Yue was confused as nothing was happening and asked, "Why is he just sitting there like that?"

"He's meditating." Katara explained, "Trying to cross over into the spirit world. It takes all his concentration."

Aang opened an eye as they continued talking with Natasha putting in, "I remember him telling us that on the end of his first spiritual journey, he found his body just like this."

"Is there any way we can help?" Princess Yue asked, wanting to be useful. Aang gave them all a purpose as he sounded annoyed, "How about some quiet!" He glanced back to the girls as he said, "Come on, guys. I can hear every word you're saying."

Then taking a calming breath, Aang resumed looking forward. He looked down into the pond to see the two Koi fish swimming around each other. Aang watched as they continued to go in a circle, and as if he fell into a trance, he felt as if the two Koi fish looked a lot like the Yin and Yang symbol. And as their dance slowed, the two looked as if they completely transformed into that very symbol. As he looked into the symbol, Aang's eyes flashed as he started to cross over.

"Well," A familiar voice shocked them. They all looked to the source as he said, "Aren't you good friends?"

"No." Katara said a she looked to the bridge on her left. Natasha readied herself as Prince Zuko walked over and said, "Yes." Then with a slight glare he said, "Hand him over, and I won't have to hurt you."

Princess Yue said, "Katara, Natasha and Aang are being attacked by a Firebender!"

"A Firebender?" Steve questioned and looked to Thor. The Asgardian questioned as well, "But we had not been alerted to any attempts from the enemy fleet? I fail to see how this could have happened."

"What did the Firebender look like?" Steve asked of the princess. Princess Yue then said, "His garments were white, not like most soldiers," this slightly confused them before she said, "but he did have a ponytail and a scar of the left side of his face."

"Zuko!" Sokka and Steve gasped. Thor then asked, "This is that prince that I heard was deceased."

"Not so deceased as we thought." Steve said. Sokka then said, "We'd best hurry."

He, Sokka and Princess Yue quickly boarded Appa's saddle while Thor quickly spun Mjolnir around. Once Appa had taken off, so did Thor.

The sun rose over the land as they waited to see what this day would bring.

As the sun continued to rise, Admiral Zhao said, "It's daybreak at last." General Iroh stood behind him as the Admiral then declared, "Let's write history. For the glory of the Fire Nation and Hydra."

Prince Zuko could feel its warming rays, he angrily growls as his head looks up. Both Katara and Natasha look up with a gasp as he used the heat from a breath from his nose to melt his prison. He dropped down into the grass before running up to them and letting loose a huge blast of fire. Katara quickly reacted by raising a huge wall of water between her, Natasha and the blast, but the force was enough to knock them both into the wooden pillar. Both girl's heads hit the back post and the blacked out from it. Prince Zuko walked over and grasped the back of Aang's shirt. He was impressed as he looked to Katara and said, "You rise with the moon." But thought himself the better of the fight as he said, "I rise with the sun."

Then looking to the unconscious spy he said, "And you have skills of your own. But my experience with the Winter Soldier made me your better."

Then without another word, Prince Zuko carried Aang away.

At the wall at the ocean, a Fire Nation ship broke through the ice. When it was further in, the ship lowered the ramp to allow the soldiers to storm in. Both soldiers of the Fire Nation and Hydra yelled as they ran forward. That ship was soon by another and it did the same as the first.

Admiral Zhao looked at the upcoming battle and was assured of his victory as he said to Iroh, "The Water Tribe can try to resist the inevitable, but even with the help of the Avengers their city will fall today."

General Iroh looked at the same scene but was his thoughts were to two others soon to be in the midst of battle.

Katara stood up and shouted, "Aang!"

"He can't hear you all the way in the spirit world." Natasha regrettable said as she shook her head. Momo chittered as he looked about for his friend. The sound of a growling bison made them look up to see Appa coming down. Sokka asked as the bison landed, "What happened? Where's Zuko?"

"And where's Aang?" Steve asked as he looked about. Katara shook her head and said, "He took Aang. He took him right out from under us."

"We can't blame ourselves." Natasha said to comfort her, "Zuko caught us off guard by a surprise attack."

"Where did they go?" Sokka asked as they looked to a sad looking Momo. Little did they know at the moment, but there was a path that led from the oasis up the glacier walls. The path stopped before a rolling blizzard that covered a good deal of the North Pole.

Trudging through the snow with an out of body Aang on his back. Prince Zuko fought against the oncoming snow storm as he tried to think of a way to get Aang back to the Fire Nation. The Fire Nation prince and the Avatar disappeared into the raging snowstorm as the snow covered up their tracks.

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Book One: Water

Chapter Twenty: Siege of the North Part 2- The Spirit World

It was a bad day for the Northern Water Tribe as the Fire Nation ships still out in the ocean continued to shoot fireballs towards the city. And to make things worse, soldiers of both the Fire Nation and Hydra had breached the main wall and swarmed across the icy plains. The four fireballs landed amongst the city, creating damage as the populace ran to safety. But invasion itself wasn't the worse thing to happen on this day, for behind the Water Tribe palace behind the city, an equally worse situation was going down. Appa stood by the left bridge while Katara fell to her knees in sadness. The two Koi fish circled each other in the pond and looked as if they could feel a bad omen on the rise. The others looked to her with tearful and worried eyes as she said, "I can't believe I lost him."

"You mean, we lost him." Natasha said and kneeled down to her while placing a comforting hand on her shoulder. Sokka then comforted them, "You both did everything you could."

"And we can still do everything we can to find them." Steve said, knowing that getting Aang back was important. Thor was in agreement and said, "Aye, we must do something to rescue our friend from the Fire Prince and put an end to this battle."

"Zuko can't have gotten too far." Sokka deduced as he and Yue walked towards Appa. Katara looked back to him as she knew that they had a point. He sounded determined as he added, "We'll find him." He reassured his sister, "Aang's gonna be okay."

"Could Prince Zuko have taken him up that way?" Thor questioned and pointed Mjolnir to the top of the walls. Princess Yue shrugged and said, "I suppose he could have."

"Though I'm a little surprised." Thor said as he tried to think about it, "Judging he too is from the Fire Nation, he wouldn't try to go back to the fleet."

"Actually," Steve recalled, "Prince Zuko and Admiral Zhao aren't exactly good friends, considering that both Zuko and Bucky tried to rescue/take us for themselves. So it's also possible that Zhao's doing the invasion by his own command."

"Look, this is all fascinating." Sokka said as he was started to grow impatient. Then he said, "But if we're going to find Aang, we need to go now."

"Okay." Katara said as she stood up. Princess Yue looked to the two Avengers and asked, "But what about the battle? My father needs you to help deal with the Fire Nation and Hydra."

"Oh, right." Thor said as he remembered there promise to Chief Arnook. Steve too remembered and then said, "The majority of you will go and see if you can find Zuko and Aang. Thor and I will help the Water Tribe fend off the enemy."

"Just until Aang returns from the Spirit World." Katara added. This shocked Steve and he asked, "Aang's gone back into the Spirit World?"

"The Spirit World?" Thor asked as he was confused. Natasha then explained, "It's a higher plane of existence where souls and other things reside."

"I do understand that part," Thor said, "But why did friend Aang have to venture there."

"He's trying to see if the Moon and Ocean spirits can help us win this battle." Natasha explained the reason. Then she begrudgingly added, "And when he crossed over, that's when we were jumped by Prince Zuko."

"Hopefully, Aang can take care of himself while he's over there." Sokka said. Climbing onto Appa he said, "But for right now, we need to find out where his body and Prince Zuko have gone."

Katara put on her parka and they all looked to see Momo sitting on the ground. The flying lemur sadly chittered as he sat where Aang once was. Katara then said, "It's all right. You stay here, Momo. In case Aang comes back."

"Or when we bring Aang back." Natasha promised while petting the lemur's head. Her, Katara and Princess Yue climbed into the saddle and sat down. Nat looked to the two Avengers and said, "Stay safe, boys. We'll try to be back soon."

"Same with you Nat." Steve nodded. With a flick of the reins, Sokka said, "Yip, yip!"

With a growl, Appa slammed his tail to the ground and took off into the air. Sokka turned the flying bison around to fly over the oasis and out into the blizzard beyond the Northern Water Tribe. The wind whistled as snow blew past them.

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Down in the oasis, Thor and Steve watched as the bison disappeared from sight. Thor then said, "Are you ready, my friend?"

"Ready when you are." Steve nodded and pulled his helmet on. Quickly spinning Mjolnir with his left hand, Thor grabbed Steve's arm before having Mjolnir fly them to the battlefield.

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The trail in the snow started to disappear from the blizzard as Prince Zuko kept trudging onward. He kept a good grip on the glowing Aang as he walked deep into the frozen tundra. Prince Zuko only looked ahead as he moved forward. Aang's body was completely unresponsive as his spirit finished crossing over.

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Spirit World

Aang opened his eyes and found himself in an entirely new setting. He still saw in the lotus position with his fists together. He blinked as he found himself in some kind of swamp and looked around. Standing over him was some kind of spirit gate while behind him was a thicket of bamboo. The sound of flapping caused him to look up and see a bird flapping about. Aang stood up and started to look around. He came to a spot in the swamp before looking to his left. The Avatar spotted a snow monkey spirit wearing a white necklace and brown robes sitting under a rock formation with a tree on top of it. The snow monkey spirit was sitting in the lotus position with his hands folded, and repeating 'Om' as Aang came running up to him. Then being polite as he can, "Hello?" When he didn't move, Aang then said, "I'm sorry to disturb you. But I just really need to find the moon and the ocean spirits."

"Go away." The snow monkey spirit said, clearly wanting to be left alone. A figure appeared behind one of the swamp trees as Aang hadn't moved. The snow monkey spirit opened an eye and noticed that Aang hadn't moved and asked, "You're still here."

"Yes," Aang said, getting impatient with the spirit, "I need-"

But the snow monkey spirit cut him off as he tried to meditate again with a loud, "Om!"

"I'm afraid he can't help you." A feminine voice said from behind Aang. He looked back to see a woman with red curly hair held up. She also wore a green dress that Aang had never seen the design before. The woman then shrugged and said, "Plus, he's not one for helping either."

"Um, hello." Aang said with a respectful bow. The woman then said, "It is a pleasure to meet you, Avatar Aang."

"If you don't mind me asking," Aang asked, "who are you?"

"I am Frigga. The mother of Thor and Loki." The woman introduced. Then she said, "And though my time in the physical world has ended, I could still see you coming here for guidance."

"You're Thor's mother?" Aang asked out of curiosity. She nodded and said, "I heard that you were looking for a couple of spirits. Perhaps I can help you."

"Great! So how do we start?" Aang asked, really wanting to help the Northern Water Tribe. Frigga then said, "If you'll follow me."

Frigga walked along a log and Aang was quick to follow behind. The snow monkey spirit peeked before shaking his head and muttering, "Ah, finally."

As they continued to walk, Aang asked, "Is Loki in the Spirit World too?"

Frigga didn't answer right away as she had a knowing smile. But she still answered him, "If he is, I'm not sure where he would be. He was never one for staying in one place." She chuckled as he said, "After all, he is the God of Mischief."

"I did hear about that." Aang nodded with a slight smile of his own. Frigga then said, "Now I wish to ask you a question."

"Okay." Aang nodded. Frigga then asked, "When coming to the Spirit World, how exactly did you plan to find the Moon and Ocean Spirits?"

The question caused Aang to stop and think about it. Frigga also stopped and turned to the boy. Aang sighed and said, "I guess I didn't. Not all the way through."

"Fear not, Aang." Frigga said as she stepped to the boy. He looked her in the eye as she said, "For the answer might just be in front of you."

This slightly confused Aang until he looked to the water to his left. Turning, he watched as the water rippled before turning into the spirit of Avatar Roku. The reflection smiled as he said, "Hello, Aang."

"Roku." Aang said in surprise. Then he finally got what Frigga was saying as he looked back. Then he said, "Sometimes, the answers are right in front of me. Or within."

"Got it in one." Frigga said with a smile.

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Physical World

The snowstorm continued to rage as Zuko continued on aimlessly across the tundra. He took in a deep breath while trudging on. But his next step turned out to be a mistake as he stepped on a patch of weak ice. The ice underneath his foot started to crack and spread. Prince Zuko gasped before sprinting away from the crumbling ice. The crumbling ice seemed to be able to keep up with Zuko mostly because of the load on his back. He continued running until he was sure that he could jump to safety. Taking a leap of faith, Prince Zuko literally leaped, but he fell into the snow while losing his grip on the Avatar. Both he and Aang's unconscious body tumbled into the snow. After taking a quick breather, Prince Zuko raised his head and looked back. A giant crater now lay between him and the way back to the Northern Water Tribe and the Fire Nation fleet. Pushing himself up, the prince panted from the exertion before spying something not too far, "Shelter."

Walking over to the disembodied Aang, Prince Zuko grabbed him by the back of the shirt and dragged him to the cave. He pulled the Avatar inside before placing him against the clod cave wall. The glowing boy didn't move as Prince Zuko removed the ropes off of his person and started to bind Aang's hands, arms and feet.

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Back at the Northern Water Tribe, Steve and Thor landed in front of the palace where Chief Arnook waited for them. The chief then gave them a report, "The Waterbenders and the warriors are able to hold off the Firebenders and the Fire Nation soldiers, but I heard that they were having a little difficulty with those of Hydra."

"Then we'll go and help out." Captain America said. Thor nodded and said, "Aye. We shall verily give them a brawl that they won't soon forget."

"Then may the spirits be with you. I will join you shortly." Chief Arnook said before standing back. Thor then started to spin Mjolnir very fast before Cap grabbed onto the Asgardian's outstretched hand. When they had a secure grip, Thor let loose and they flew towards the battlefield.

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Spirit World

"Roku," Aang said as he looked down to the reflection of his predecessor with worry, "the Water Tribe is under attack by the Fire Nation and Hydra. I need to find the Moon and the Ocean spirits."

Avatar Roku then turned into a spout of water that rose in front of Aang and Frigga. He then told them, "The ocean and the moon are ancient spirits. They crossed over from the Spirit World to the Mortal World very near the beginning." Looking to Frigga he then said, "There is only one spirit that we know of who is old enough to remember where they would be now."

"Who?" Aang asked, feeling as he was getting closer to answer. Frigga then warned, "Be wary, young Avatar. This particular spirit is not like most spirits."

"She's right, Aang." Avatar Roku agreed. Then he revealed, "The spirit's name is Koh, and he is very dangerous." He closed his eyes as both he and Frigga gave the ominous warning, "They call him "The Face Stealer"."

Aang's eyes widened in horror from the sound of Koh's other name. Avatar Roku then warned, "When you speak with him, you must be very careful to show no emotion at all."

"That's how he ensnares his prey." Frigga added. Aang looked to her and she said, "Koh feeds on the emotions of other souls and spirits, adding the faces of his victims to his collection."

"Even the slightest expression and he will seal your face." Aang became scared as he thought of that happening to him. But then calming himself, Aang nodded as he now knew what needed to be done. A comforting hand from Frigga made Aang turn to her. She had a motherly smile as she said, "But you need not worry. I will be with you every step of the way and back again. I've even had the slight comfort of having a conversation with him."

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Physical World

Appa growled as he stepped through the snow as the group continued to search for Aang and Zuko. Sokka and Natasha jumped off the bison and took a few steps forward to see if they could pick up the trail. But all the two could see was a huge chasm ahead in the ice. But they didn't see any signs of their friend or the Fire Nation prince and turned back to Katara and Princess Yue to shake their heads. Katara's face fell as she had hoped that they would find their taken friend. Sokka and Natasha quickly ran back to Appa and climbed onto the bison's head. When they were secure, Sokka gave a flick of the reins to make them airborne.

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Prince Zuko rubbed his hands together in an effort to warm himself. Then raising them to his face, he blew small flames to warm them. He thought of his situation, "I finally have you," He glanced over to the glowing, unconscious and tied up boy as he then begrudgingly said, "but I can't get you home because of this blizzard."

Standing up he then ranted about how things would go for him, "There's always something. Not that you would understand." Then he looked down as he wished, "I do wish that I had Bucky here with me. He might know what to do."

He chuckled as he used his friend's nickname. But his smile fell as he recalled most of his life, "But you're like my sister. Everything always came easy to her. She's a firebending prodigy and everyone adores her." He glanced back as he bitterly said, "My father says she was born lucky." He glared as he remembered his father's words to him, "He says I was lucky to be born."

Clenching his fists, he stood confident as he admitted, "I don't need luck, though." With a shake of his head he said, "I don't want it, either." But his gaze softened as he admitted, "But help I don't mind."

He thought of his uncle and the Winter Soldier as he added, "I've always had to struggle and fight, whether on my own or with someone by my side. And that's made me strong." He turned from the entrance and closed his eyes, "It's made me who I am."

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Back at the battlefield, the Fire Nation ships continued to launch fireballs at the city while soldiers of the alliance marched forward. The Fire Nation soldiers used a combination of smaller fireball launchers mounted onto Komodo Rhinos while the Hydra soldiers raised weapons that had a large head. They aimed the RPGs at the next wall and opened fire. The Water Tribe ran out of the way as the rockets detonated against the wall. The entire ice wall section had been completely blown away by the time Thor and Captain America touched down. Cap saw Master Pakku not too far and shouted, "What have we got, Master Pakku?!"

"Fire Nation soldiers launch both big and small fireballs from either the ships or from their mounts." Master Pakku quickly told him, "And those of Hydra are firing some kind of magical weapons as well. We're throwing everything we have to stop, but the combined army is starting to overwhelm us."

"Then let us use a two stage attack." Cap said. Both Pakku and Thor looked to him as the super soldier explained, "Me and Thor will go out first and try to get the soldiers to deplete their resources, whether by their hand or our own. And while their occupied, the Northern Tribe can come in from behind with all that they've got."

"Sounds like a plan to me." Pakku said, not having anything better. Thor nodded and said, "Then let us go knock a few heads."

Captain America and Thor quickly ran from behind the cover of the ice wall. Thor lifted Mjolnir up to the sky as it summoned a lightning bolt before firing it at an incoming rocket. The lightning caused the projectile to explode while the rest of the lightning rushed towards the launcher. The Hydra soldier yelped in pain as the lightning made his weapon explode. Cap then used his shield to block the rounds of bullets coming at them while Thor rushed forward and bashed Mjolnir hard against the broad side of Cap's vibranium shield. The duel move caused a shockwave that caused most of the soldiers to stumble. They both had to duck when tanks came rolling up and started to shoot fireballs from them. But a quick bashing from Mjolnir dented the opening. The hammer came back to Thor's outstretched hand and he grabbed it. Thor then said, "I noticed machine parts at the Northern Air Temple. I imagine that these are the same kind of weapon."

"Yep." Cap said before taking up a spear and blocking a sword stroke with his shield. The blade bent backwards from contact against the shield and with a quick jab from the spear, the soldier cried out in pain as his legs were slashed. Captain America then threw the spear at a Hydra soldier and that soldier grunted when the spear impaled his chest.

Cap and Thor continued to battle against which ever soldiers came their way. More tanks started to roll forward, but the Waterbenders on top of a defensive wall with waterfalls stopped the flow before sending it forward. The rush of water knocked the tanks back. But the tanks further behind launched grappling hooks to the walls. Some were able to penetrate the ice, but some were diverted by Cap's shield and Mjolnir. Those that did reach the wall pulled the sections out with a loud crash. Captain America looked back to see that Komodo Rhinos and their riders were breaching the wall. With a hefty throw of his shield, it was able to hit a few before a shot from a Hydra soldier knocked it to the ground. Cap was able to pick up a fallen soldier's spear and shield from the Fire Nation. With a shrug he said, "Not what I usually use, but, beggars can't be choosers."

Looking to Thor he said, "Plan's not working! We need to fall back!"

"You go and help Pakku!" Thor refused. Then he sounded determined as he said, "I will draw a line for myself here."

"Me and a few soldiers will help you, Thor Odinson." Master Pakku said from behind. He and a few students of his raised a shield of water to block both fireballs and blasts from Hydra's weapons. The waterbending master looked to Cap and said, "Hurry, before more of them reach the city."

The super soldier nodded and quickly dashed towards the wall. As he ran, he sliced the sword through the leg of one enemy and bashed the shield against another. He looked back ahead in horror as more sections of the wall came down. He noticed that he came running up to his shield and chucked his borrowed one at a soldier. The soldier grunted as he fell to the ground and Cap picked up his respective shield. Then with a throw of his other arm, he sent the sword flying before its hilt struck the helmet of another soldier. As he looked at the swarms of enemy soldiers he muttered, "I sure hope Katara's group or Aang are having better luck than we are. Plus, I wouldn't mind a little of the Hulk right about now."

Captain America yelped before covering his face with his shield as another fireball came right at him.

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On Admiral Zhao's flag ship, it and a few others were currently docked just a few yards from the wall. Standing behind the admiral on the observation deck, Iroh then told him, "I don't need to remind you that we have a time limit seeing as how it's almost near midday. If we don't defeat the Water Tribe before the full moon rises, they will be undefeatable. And not even Hydra will be able to stand against them."

"I assure you I have everything under control." Admiral Zhao said as he looked to the general. Then he let it slip a little of his plans, "I intend to remove the moon as a factor."

Iroh's eyes widened from this and questioned, "Remove the moon? How?"

"Admiral Choi!" A voice said from behind. Both men looked back to see a Fire Nation soldier running up to them with his spear raised. The soldier removed his helmet and it was revealed to be Hahn as he declared, "Prepare to meet your fate!"

"I wouldn't do that, young man." A Fire Nation officer warned beside him. The man had white hair, a small moustache and orange tinted glasses. Then he said, "You might regret it."

But Hahn pushed past him while pointing his spear at Zhao. Then with a yell he rushed up to impale the Fire Nation officer. But Zhao moved out of the way and allowed Hahn to rush past them. Then Zhao shoved Hahn over the railing and Hahn screamed as he fell. Iroh watched as the teen landed in the ocean with a splash. Iroh shook his head at such a poor tactic. But not taking any chances, Zhao looked to the soldiers behind him and ordered, "Go fish him out of the ocean, and then find out if he's got any aid. Interrogate them to see what they know."

The Fire Nation and Hydra soldiers nodded before rushing back into the bridge. Zhao then turned back to the Northern Tribe and said, "As I was saying…" He told a little secret of his past, "Years ago, I stumbled upon a great and powerful secret. It's even just as great and powerful as our allies of Hydra." He smirked while Iroh's eyes widened as Zhao said, "The identity of the moon spirit's mortal form."

"What?" General Iroh asked, not fully understanding what Zhao was getting at. Zhao closed his eyes as he remembered, "I was just a young lieutenant serving under General Shoo in the Earth Kingdom."

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(Flashback)

A younger Zhao sat at a desk in a room filled with scrolls as the present day Zhao said, "I discovered a hidden library, buried under the ground in fact."

The Zhao of the past continued looking through tomes and scrolls, tossing away what he didn't deem worthy, "I tore through scroll after scroll. One of them contained a detailed illustration and the words moon and ocean."

Younger Zhao's eyes widened and thought this was a divine moment for him as older Zhao said, "I knew then that these spirits could be found and killed."

(End of Flashback)

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Zhao looked ahead as he knew that he was close to achieving this goal as he said, "And that it was my destiny to do so."

"Zhao!" Iroh warned with a stern gaze, "The spirits are not to be trifled with."

"Yes, yes, I know you fear the spirits, Iroh." Zhao nodded causing Iroh to back up a little. Then he brought up the general's past, "I've heard rumors about your journey into the spirit world." He leaned against the railing and said, "But the ocean and moon gave up their immortality to become a part of our world." They looked to the smoking ruins as he said, "And now they will face the consequences."

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Spirit World

Aang and Frigga quickly journeyed through the Spirit World to Koh's dwelling. They came across the large tree and found that their path was separated by spaces. Frigga was able to keep up with Aang thanks to her Asgardian reflexes. They jumped across the stones and stopped on one when they saw a large wolf spirit walk around the tree. When it was gone, they continued on their way to the dead looking tree. They soon reached the base of the tree and looked about for the opening. They ran up a root before looking down to see an opening. Aang began to feel anxious about going into the dark place before Frigga stopped him with a hand on his shoulder. He looked to her as she pointed to something. He looked to see a little monkey spirit sitting on a root and took a deep breath thinking that was his feeling was about, "You're just a curly-tailed blue nose monkey spirit."

But when the monkey turned to look at him, Aang gasped when he saw that the spirit didn't have a face. Frigga then said, "Best to control yourself now, before going down into Koh's dwelling."

"Right." Aang nodded. Then taking in a deep breath, he repeated what Roku said as if his predecessor was there, "Show no fear/Show no fear. Show no emotion at all/Show no emotion at all."

Keeping an emotionless face, both Aang and Frigga walked down into the mouth of the cave. The two walked down a long flight of stairs, each step taking them away from the light. Aang wanted to ask questions, but believed that it would create emotions. While keeping a calm face, he asked, "Hello? We're looking for a spirit named Koh?"

As they went further down, they could hear the sounds of something in the cave with them. Frigga then took a turn, "Come now, Koh, we need your counsel."

As they came down to a more flat section of the cave the sounds intensified. Aang looked around for any signs of the spirit, but it seemed that he barely missed seeing something. Frigga then told him, "Be ready, Aang."

They continued to look about as a white face appeared from the shadows. The face grinned as he thought of two new faces to his collection. Both Aang and Frigga put on emotionless faces as Koh ran around and said, "Welcome."

Aang and Frigga only blinked to the spirit, not letting the slightest of emotion through. Then with a respectful bow Aang said, "Thank you for seeing us."

"My old friends, The Avatar and Lady Frigga of Asgard." Koh said as he moved about. He came up behind the two, hoping to startle them or creep them out as he said, "It's been a long time with one of you, and not so long with another."

"I know that you know of Lady Frigga." Aang said, but was confused and didn't show it as he asked, "But you know me?"

Koh moved in front of them and rhetorically asked, "How could I forget you, young Avatar?" The lid closed and opened to reveal the face of a man with a short beard and a long moustache. He bitterly remembered, "One of your previous incarnations," He turned to the boy and tried to scare him by pointing his sharp legs at the boy while he said, "tried to slay me eight or nine hundred years ago."

"I didn't know that." Aang said, feeling both sorry and confused. Then he asked, "Why did he or I try to kill you?"

"Oh," Koh said while switching his face to that of a woman's, "it was something about stealing the face of someone you loved."

Aang and Frigga looked into Koh's stolen face before it turned into that of the monkey's spirit from earlier. Koh gave a menacing laugh even though he didn't scare them. But Koh shrugged and told them, "Of course, that's all behind us." Then circling around the boy he said tried prey on Aang's sympathies, "Why should I hold a grudge against you for something you did in a past life." Then he reminded, "After all, you're a completely different person now." He came closer and whispered, "You've come to me with a new face."

Then turning his attention to Frigga he said, "And it has been quite some time since you and I have spoken. How has your time in the Spirit World been?"

"Good." Frigga said as the spirit moved around to her face. Then she said, "And though I do miss my loved ones, I know that I will see them again." Then she said while remaining calm, "With my face of course."

Koh chuckled to this small joke and said, "Yes, yes. Keep thinking those hopeful thoughts."

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Physical World

Aang's body took in a deep breath, slightly startling Prince Zuko. He thought the Avatar was about to come back to this world. But when Aang's tattoo's didn't stop glowing and he didn't move, Zuko took in a breath. Looking back to the storm he said, "I guess we'll be here for a while."

The wind kept whistling as the blizzard rolled on.

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Appa flew over the snow covered tundra with Natasha and Sokka on his head while Katara and Princess Yue sat in the saddle. Princess Yue looked to Katara and saw that she was still upset. Then she tried to comfort her friend, "Don't worry, Prince Zuko can't have gotten too far in this weather."

"I'm not worried they'll get away in the blizzard." Katara said as she looked away. She was more worried about them living in this cold weather, "I'm worried they won't."

"They're not going to die in this blizzard." Sokka reassured from his spot. Natasha agreed and said, "Yeah, judging from how Zuko was looking when we last saw him, I'd say that he's been through a lot worse. He knows how to keep going."

"They will survive, and we'll find them." Sokka chimed in. Then he said, "So let's keep looking for them."

The girls nodded and they looked to the ground to see any signs of them.

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The battle was slowly turning out of the Water Tribe's favor as they kept being forced back. One soldier said to Cap, "This is getting ridiculous! It's like when we beat at least one of them, two more take their place!"

"That's how Hydra works!" Captain America told him. He looked to the back of the battle and hoped that Thor was having much better luck.

The prince of Asgard spun his hammer really quickly as a squad of Fire Nation soldiers unleashed a mighty torrent of flame. Then with a quick motion of his hand he was able to use the force to knock them back. As the Fire Nation soldiers fell to the ground, the Waterbenders were quick to use a huge spray to knock ordinary soldiers and Hydra soldiers off their feet. Thor looked to the outer wall and his eyes widened as he saw more tanks descending from the ramp.

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Spirit World

Frigga and Aang stood still as Koh moved about them, know with an owl spirit's face. The spirit tried to get to Aang's face by saying, "It's been a long time since I've added a child's face to my collection." But getting back to what Frigga said a few moments ago he asked, "So how may I help you two?"

"We need to find the moon and the ocean." Aang told him. Koh came back around to Aang and said, "Their spirit names are Twee and La." Then he crawled around the wall and said, "Push and pull. And that has been the nature of their relationship for all of time."

"Please, help us find them." Aang pleaded without letting emotion through. Then he added, "An entire civilization could be destroyed if we don't get their help."

Koh switched his face to that of an old man that somewhat looked like Master Pakku as he said, "Oh, you think that you need their help?" Then he pointed out, "Actually, it's quite the other way around."

"What are you talking about?" Frigga asked, not understanding. Switching his face as he darted for them to get a reaction, he had a face that resembled the Blue Spirit as he shouted, "Someone is going to kill them!"

"What do you mean?" Aang asked him, "How can we find them and protect them?"

"You've already met them, actually." Koh said while changing back to the first face they saw. Then making his body stand tall he said, "Twee and La- your moon and ocean- have always circled each other in an eternal dance. They balance each other." He flexed as he gave synonyms, "Push and pull. Life and death. Good and evil." Aang's eyes widened as Koh then said, "Yin and Yang."

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(Flashback)

He remembered seeing the Yin and Yang symbol from watching the Koi fish in the Oasis pond. Though it was slow, he remembers watching them slowly transform into the very symbol that helped him to cross over.

(End of Flashback)

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"The Koi fish!" Aang excitedly said. Frigga was about to say something but didn't as Koh rushed up to try and take the boy's face while taking on the Blue Spirit's face again. But he was disappointed when he found an expressionless Aang looking him in the eye. Aang then respectively said, "We must be going now."

Koh switched to a face that somewhat reminded Aang of Admiral Zhao. Koh then said, "We'll meet again." Looking to Frigga he asked, "You plan to come back?"

"Who knows." Frigga shrugged as she and Aang turned to take their leave. As they walked out of the cave, Koh slunk back into the shadows to wait for the next opportunity to steal another's face.

When they neared the exit, both Aang and Frigga hurried out. Frigga looked to Aang and said, "Such mischief. Loki would be proud."

"Sorry about that." Aang apologized. Frigga shook her head and said, "Don't be. You were able to get the information and keep your face." But then she said, "But now we must hurry."

"Right." Aang nodded and they walked over to where a pull of water sat. Looking down to his reflection as it turned into Roku, he said, "The spirits are in trouble. I need to get back to the physical world."

"A friend is here to guide you back." Avatar Roku said before his reflection turned into that of another spirit. A giant panda took his place and Aang happily turned and said, "Hei Bai!"

The panda spirit purred as he lowered himself for Aang and Frigga to climb on. Both of them quickly climbed on and hung on tight. Aang looked back to Frigga and said, "It's good to feel emotions again."

Frigga laughed before looking to Hei Bai and said, "With as much speed as you can muster, Hei Bai."

Hei Bai gave a growl before taking off. The panda spirit bounded back across stones as quickly and carefully as he could.

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Physical World

The North Pole was in ruins as the Fire Nation and Hydra continued their advance. Night time was soon upon them again and the Waterbenders were able to fight back much better than they did during the day. But fireballs were still raining down upon the city. Water Tribe citizen's scrambled to get to safety as they screamed in fear. Two rushed past a totem pole made of ice that was soon crushed by an incoming tank. The tank continued to shoot fireballs while the Waterbenders defended against them. As one tank took aim at a couple of Waterbenders, Thor yelled as he came down on the tank and caused it to crumble underneath.

In the east, the moon started to rise and the Waterbenders were able to feel its power flow through them. One Waterbender dropped down in front a platoon of soldiers and with a parting of his hands, he was able to make the bridge under the soldiers crumble. Both Fire Nation and Hydra alike yelled as they fell. The rest yelled as the Waterbender pushed the bridge back. Another soldier stood in the way of a tank as it advanced and caused it to sink into the ice. Quickly blocking a blast of fire, he then sent a chunk of ice that dented the opening hatch. A group of Waterbenders launched shards of ice at the enemy soldiers. Those with shields were able to hide behind them, but other soldiers weren't so lucky as the ice embedded themselves into their bodies.

A group of regular soldiers stood against Master Pakku before he sank them and encased them in ice. He ducked under a fire blast from a Firebender and noticed that he was completely surrounded by soldiers and tanks alike. Then with a few spins of his body and hands, he was able to send a wave of ice that cut through the tanks wheels. He repeated the action on the other tanks and crippled them. Some soldiers behind him tried a sneak attack, but Master Pakku encased them in rising ice before creating a tornado of water around himself and was able to deflect any shots that came up at him. Then with a huge wave around the tornado, he was able to knock the other Firebenders away.

A trio of Waterbenders moved in unison to throw a tank off the ground. The soldiers near the tank moved back while the tank was sent flying through the air. The tank landed in front of Admiral Zhao and his group. They had long since come ashore to enact Zhao's master plan to win the battle. Zhao wiped some of the snow off his shoulder while another Firebender melted the snow off of him. Then he told his group, "We'll be following this map to a very special location." He placed it in his armor while saying, "And when we get there," A dark smile crept on his face as he said, "we're going fishing."

But before they went any further, Admiral Zhao looked back to one last member of his party. The Winter Soldier looked to him as the Admiral then ordered, "Go and take care of the Avengers!" The assassin nodded and said, "And make sure that you don't screw it up."

The Winter Soldier nodded again before taking off to the city. Admiral Zhao then motioned with his hand for them to keep moving.

As the Winter Soldier made his way across the frozen ground, Captain America could see him coming from the wall. Knocking down a Fire Nation soldier, Cap moved to intercept his friend.

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Spirit World

Hei Bai ran through a thick fog as he entered the swamp lands with his passengers on his back. They soon came across the gate where Aang first appeared. The Avatar slid off the panda spirit's back and said, "So this is the way I came in," turning back to Hei Bai and Frigga he asked, "but how do I get back?"

"Step underneath the gate and Hei Bai can help you." Frigga said with a smile. Aang did as instructed and stood between the posts. Hei Bai stood on his back legs and took in a deep breath before unleashing a gentle beam of energy at Aang. Aang could feel himself passing through the barrier again. Frigga then said, "Tell Thor that I love him."

In the next instance, Aang vanished from the Spirit World and back to the Physical World. The snow monkey spirit had moved to a different spot while opening an eye and sounded relieved as he said, "Good riddance."

"Hei Bai." Frigga calmly said. The panda spirit didn't have to be told twice as he morphed into his angry form and came up to the snow monkey spirit. Then with a roar he unleased a blast of spirit energy that sent a screaming monkey flying backwards. Frigga walked over as Hei Bai returned to his true form and looked to the Asgardian. Frigga looked up into the sky of the Spirit World and said, "Good luck to you, young heroes."

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Physical World

Aang's astral body appeared under the spirit gate where left the mortal plane. He looked down to the sleeping Momo and said to the lemur, "Momo!"

"Momo?" He reached down to pet the lemur, but quickly noticed that he wasn't in his body. He looked around and said, "Oh, no- where's my body? And where are the girls?"

His entire being glowed into a sphere of light before blasting off into the air. Aang's spirit flew high into the air before turning southward towards his body.

From the battlefield, Steve looked up and saw the moving light, "Aang."

The blizzard ended as Appa kept flying. The four kept searching for Aang and Prince Zuko when Katara felt a familiar presence. Looking back she saw a stream of light and pointed, "Look, that's got to be Aang!"

"His spirit must be heading towards his body." Natasha said as they all looked to see the spiritual energy fly. Sokka turned the reins to guide Appa in that same direction while Katara shouted, "Yip, yip."

Appa groaned as he turned in the direction just as the spiritual energy came closer. It went inside Aang and Zuko's hiding place before reentering his body. Aang's tattoos stopped glowing and opened his eyes. He gasped when he felt himself restrained, tried to break free and then moved himself into a sitting position. The first person he saw was Prince Zuko standing at the back of the cave. The Fire Nation prince then said, "Welcome back."

"Good to be back." Aang said with a glare before taking in a deep breath. Prince Zuko saw that he was about to pull something and moved to intercept, but Aang unleased a gust of wind that not only knocked Prince Zuko back but also shot Aang out of the cave. Aang grunted as he tumbled into the snow and rolled to a stop. Then acting like an inch worm, Aang tried to crawl away. But it wasn't enough as Prince Zuko quickly caught up with him and yanked him out of the snow. Holding him with both hands, Prince Zuko chided, "That won't be enough to escape."

But the growl of a certain bison caused them to look up and Aang happily shouted, "Appa!"

The flying bison landed not too far away and both Natasha and Katara stood up. But a hand from the Waterbender stopped Nat in her tracks. Katara looked to the spy and said, "Let me have this one."

"Alright then, Katara." Natasha agreed and sat out of it. Katara hopped down from the bison and landed in the snow before taking her stance. Aang looked to Zuko with a smile before the prince dropped him and he yelled, "Whoa!"

"Here for a rematch?" Prince Zuko questioned as he took up his stance as well. Katara glared as she said, "Trust me, Zuko, this isn't going to be much of a match."

Then raising her arms she created a wall between her and fireball. The snow canceled out the fire before Katara threw a wave of slush at the prince just as he prepared another fireball. But a rising mound of slush around his person stopped him. Prince Zuko cried out as he raised into the air before being brought down with a loud thud. The prince was knocked unconscious as he hit the ground and snow covered him and the bound Aang. Sokka came running up to Aang and started cutting the ropes with his boomerang. When he had begun to get Aang loose, he complimented the binds, "Hey, this is some quality rope."

"Shall we tie you up to test that?" Natasha joked from the saddle. Sokka glared at her while sarcastically saying, "Ha, ha!"

"We need to get back to the oasis!" Aang said with urgency. This confused everyone as Natasha said, "Why what's going on?"

"The spirits are in trouble." Aang said as he handed the rest of the rope to Sokka. Both the boys quickly ran back to Appa and Aang jumped onto the bison's head. As Natasha and Princess Yue help Sokka into the saddle, Aang looked back to the unconscious Zuko and said, "Wait." The other's looked to him as he said, "We can't just leave him here."

"Sure we can, let's go." Sokka said without a second thought. Natasha seemed to agree with him and said, "He does deserve this, but…" Aang was quick to disagree, knowing that all life deserves to be treated fairly, jumped off while saying, "But if leave him, he'll die."

"Yeah, this makes a lot of sense." Sokka sarcastically said as Aang ran over to the unconscious teen. Then he added, "Let's bring the guy who is constantly trying to kill us."

"But, think of at least some benefits of having him as a prisoner." Natasha said as she thought about it. Sokka then realized it as well and said, "Even though he's banished, it could give us an edge in the war."

"Bingo." Natasha said with a nod. Aang hoisted Zuko onto his shoulders and carried him back to Appa. Then hopping into the saddle, he set Zuko down and said, "Tie him up. That way he can't run."

Then jumping onto Appa's head, Aang sat down, grabbed the reins and flicked them while saying, "Yip, yip!"

Appa groaned as he slammed his tail onto the snow covered ground and took off into the air.

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Back on the battlefield, Captain America ran through the streets as he looked for his friend. He ran up a flight of twirling stairs and when he came at the top, he stopped. Standing on the other side of the bridge, the Winter Soldier stood with his weapon slung over his back. Cap looked his friend turned enemy in the eye and said, "I know you're in there, Bucky."

The Winter Soldier said nothing as he unslung his weapon from his back. Cap then said, "If we're gonna fight," he let his shield fall from his hand and stated, "then let's at least do it hand to hand."

The assassin looked from the super soldier to the dropped vibranium shield. Noting that Cap didn't look to make any moves to retrieve it, the Winter Soldier dropped his weapon as well. The gun thumped against the ice as both fighters readied themselves. A second later, both super soldiers rushed towards each other and lashed out a fist. Their fists collided against each other. Captain America grabbed a kick to his middle and backed up when the Winter Soldier lashed out with his metallic hand. The Winter Soldier took this as an opportunity to deliver a kick to the captain's chest. Cap rolled backwards before rising to his feet once again. Looking his foe/friend in the eye, he said his trademark line, "I can do this all day."

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On the battlefield, Thor swatted fireballs and large projectile weapons away from the soldiers behind them to defend them. They were being pushed back by every step, and Thor truly wished that he had a little more aid as both he and the Water Tribe fought against their enemies. Looking back to the Waterbenders of the group he ordered, "Create a wall between me and yourselves!"

The Waterbenders nodded and formed an ice wall that separated them from Thor and the attacking enemies. Then pointing Mjolnir into the sky, Thor summoned as much lightning as he could before leaping high into the air towards the enemy. Both the Fire Nation and Hydra looked up in terror as Thor came back down. One officer shouted, "Retreat!"

The soldiers started to run, but it was too late as Thor came down and slammed Mjolnir into the ground. It created a shockwave that rolled across the ice and made the soldiers fall to the ground. Looking back to the Water Tribe warriors, Thor then shouted, "Now!"

The warriors defending the north shouted in unison as the Waterbenders dropped the wall and ran out with weapons made from ice, steel or bone. Following behind the God of Thunder, they shouted war cries as they engaged the enemy worthy for the halls of Valhalla.

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At the oasis, the black and white Koi Fish, Twee and La, were still swimming around each other in circles. But it was interrupted when a hand plunged into the waters and grabbed the white fish. The Ocean Spirit swam away while the Moon Spirit struggled as its mortal form was stuffed into a sack. As it struggled in the sack while Zhao raised it from the water, the moon above the world turned blood red. The red light caused everything below in the North Pole to take on the same hue of color.

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From their small duel on the bridge, both Captain America and the Winter Soldier looked up to see the moon turning red. They both knew that something bad was happening.

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Down further on the battlefield, Thor and his ragtag team of Water Tribe warriors had just beaten the latest squad of the enemy. As a tank came rolling up to them, they erected an ice wall just as the moon started to turn red. The ice wall fell just as it was about to be frozen. Thor saw this shift in the battle and quickly moved to bat away and fireballs that came at them.

Master Pakku's water tornado quickly ended with him falling to the ground. Other Waterbenders felt the disappearance of their connection as their attacks and defenses failed. They couldn't even hold back the Komodo Rhinos anymore.

The Fire Nation and Hydra quickly took advantage of their weakness and pressed their attack. The Firebenders launched a three pronged attack by shooting a fireball from their fists and another one from their feet. They repeated their attacks while the soldiers of Hydra opened fire with their weapons. Those able to escape the onslaught were able to duck and cover while trying to figure out a way to turn the tide.

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Elsewhere in the Fire Nation, the Red Skull had finished reporting to the Fire Lord of their progress. The main base of Hydra was standing just a couple of miles from the capital city. Johann Schmidt looked up into the night time sky and his eyes widened at the sight of the moon turning red. He then said, "It appears that the Admiral is doing all he can to win."

"And yet it will throw the world out of balance. Into chaos." A voice said from behind. The Red Skull looked back to see the robotic body of Arnim Zola coming to meet him. Zola then said, "If he is not careful, then there might not be a world to take control of."

"I highly doubt that." The Red Skull dismissed, "I'm sure that Captain America and the Avatar will figure out a way to put the moon back."

"How do you know of this?" Arnim asked. Schmidt then said, "Because they are heroes. And this is what heroes do." But turning to the automaton he then ordered, "I plan to recall the Winter Soldier. I want you to put him in deep freeze."

"But you said that he was currently engaging Captain America." Arnim Zola said, becoming confused. Then he asked, "Should we not allow him to complete his mission?"

"Unfortunately, the programming that you installed and reintegrated is starting to come loose. He will more than likely try to turn to the Avengers side." The Red Skull said. Then with a sigh, the leader of Hydra then said, "Besides, I believe it is high time that we went with Plan B for eliminating the Avatar, the captain and the Avengers."

"Ah, yes." Arnim's robotic head nodded, "The team that you put together."

"Yes." Johann agreed. He then said, "When I pull the Winter Soldier from the battlefield, you will place him under and I will give command of the team to the princess."

"She may not like that." Arnim pointed out. Schmidt then said, "She will do anything to please her father, not that she has anything to worry about."

"Then it will be done." Arnim promised. They both looked up to the red moon.

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Appa flew by the red moon as he made his way back to the Northern Water Tribe. Both Aang and Princess Yue clutched their heads as if feeling a great pain in their heads. Sokka moved to the princess and asked, "Are you okay?"

"I feel faint." Princess Yue said as she felt a sudden shift in the balance. Natasha then questioned, "It has something to do with the moon going red, doesn't it?"

Aang then said from the saddle, "I feel it, too." Katara and Natasha looked to him as he gazed up to the moon and told them, "The moon spirit is in trouble."

"Then we need to hurry back, double time." Natasha said. Aang nodded and flicked the reins to make Appa go faster. As they continued on their way, Princess Yue said to the group, "I owe the moon spirit my life."

"What do you mean?" Sokka asked as h leaned forward. Natasha then asked, "Did it save your life?"

"It did." Princess Yue nodded. Then she told the others her story, "When I was born, I was very sick and very weak. Most babies cry when they are born…"

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(Flashback)

"But I was born as if I were asleep, my eyes closed." A younger Princess Yue laid in a crib with her eyes closed and her hair just like every other baby of the Northern Water Tribe.

"Our healers did everything they could." Three healers used the healing side of Waterbending to see if they could help the princess. Her mother and father watched from the sidelines, worried about their daughter.

"They told my mother and father I was going to die." A younger Yagoda stood beside the troubled parents as Yue's father held his wife. Two other healers stayed next to Princess Yue as Yagoda told them the terrible news.

"My father pleaded with the spirits to save me." Chief Arnook stood by a window looking up to the moon as he prayed for his daughter's recovery.

"That night, beneath the full moon, he brought me to the oasis and placed me into the pond." Chief Arnook and his wife carried Princess Yue to the oasis and stood by the pond. Carefully placing his daughter in the water, Chief Arnook waited to see if the spirit's would help, and they did.

"My dark hair turned white. I opened my eyes and began to cry." They watched as the baby's hair quickly turned from black to white, her eyes opened and she let out her first cries.

"And they knew I would live." Both the chief and his wife were happy that Princess Yue would live as they looked down to their daughter.

(End of Flashback)

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"That's why my mother named me Yue," Princess Yue finished her tale, "for the moon."

The group didn't know what to say about the princess' story as they continued flying.

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Admiral Zhao still had a hold of the spirit in the sack as he turned to face the moon. He made it sound as if he had become a god or something as he said while raising the sack, "I am a legend now." He was proud as he felt his accomplishment would be remembered for all time, "The Fire Nation will, for generations, tell stories about the great Zhao who darkened the moon with the aid of Hydra." Then he began thinking of names they would give him, "They will call me Zhao the Conqueror, Zhao the Moon-slayer!" He made it sound dramatic as he said, "Zhao, the Invincible!"

But Zhao the Invincible was humiliated when a certain flying lemur jumped on his head. Zhao shouted for help while Momo messed with him, "Oh! Get it off! Get it off!"

The lemur went as far as pulling on the Admiral's side burns. The Firebenders moved to help their commander, but Momo saw a familiar sight and quickly jumped off and flew across the pond. Zhao and his Firebenders looked up and saw Avatar Aang, Sokka, Katara and Natasha standing at the ready while Aang held out an arm for Momo. Momo landed on the limb and ran behind Aang's head. Both sides stood at the ready while Natasha taunted, "Ready when you are, hotheads."

This caused most of the Firebenders to growl in irritation to this. But when the four heroes moved to engage, Zhao lifted the bag and a fist while threatening, "Don't bother."

"Zhao," Aang warned, knowing what he planned to do and put up his hands to calm the tension, "don't."

Sokka, Katara, and Natasha were also wide eyed to the admiral's plan and relaxed their guard. Zhao then said, "It's my destiny to destroy the moon and the Water Tribe."

"Destroying the moon won't hurt just the Water Tribe." Aang said, trying to make the admiral see reason. A figure snuck in from the side path with a hood covering their face. He pointed out, "It will hurt everyone, including you, the Fire Nation and Hydra. Without the moon, everything would fall out of balance. You have no idea what kind of chaos that would unleash on the world."

"I would listen to him." Natasha pointed out. Then she added, "Seeing as how he's the one with the knowledge of keeping the balance of the world."

"They are right, Zhao." A new voice said from the side. They all looked to see a figure standing on the left bridge. Zhao immediately knew who it was as he addressed him, "General Iroh." The admiral didn't look so surprised when he said, "Why am I not surprised to discover your treachery?"

"I'm no traitor, Zhao." Iroh said as he removed his hood. Then he knew for a fact, "The Fire Nation needs the moon, too. We all depend on the balance."

Zhao didn't move as he had a fist ready for a fiery blast. Iroh then warned him as he assumed his stance, "Whatever you do to that spirit, I'll unleash upon you tenfold!" Then with a strict gaze he ordered, "Let it go, now!"

Admiral Zhao tried to keep his hardened gaze, but it softened as it appeared he had listened to their wisdom. Kneeling down to the pond, he set the spirit back into the pond. The moon spirit's return caused the moon above them to return to normal. As the rest of the color's returned, Zhao's gaze once again hardened and he stood up while raising his hand. Then with a yell he created a slash of fire before the moon spirit could get away. Iroh and the group of heroes were horrified at what Zhao had done and looked up into the sky. The moon faded from the sky, indicating that the moon spirit was killed. Iroh sent a fireball at Zhao, but the Admiral ducked and the Firebenders moved to protect him. Natasha came running up the other side while delivering a roundhouse kick to a Firebender's face. While she and Iroh were taking care of the Firebenders, Zhao took the opportunity to sneak away.

Iroh engaged two Firebenders while Nat took on the other two. Iroh was able to deflect the flame fists and kicks that came their way while launching a few of their own. Natasha leapt onto one of the Firebenders before pulling him down and kicking him over her head. He plowed right into the other one before all four ran from the losing battle. But they wouldn't get far as Nat used her stingers to launch four projectiles at them. All four Firebenders yelled in pain as electricity was zapped through them and they fell to the ground. All four of them groaned in pain while Natasha and Iroh turned their attention to the pond.

The ocean spirit swam around the moon spirit that was floating belly up with a nasty looking burn on its body. Aang, Sokka, Katara and Princess Yue all were horrified at what just happened and moved to see what could be done. But none of them had noticed that a certain Prince had escaped from them.

They all stood together, looking down at the spirit's limp mortal form. Iroh kneeled down and scooped the fish out of the water. When it didn't seem to have any life in it. Princess Yue sounded distressed as she wept, "There's no hope now."

"Don't say that." Natasha shook her head. Then she added, "There's gotta be something we can do."

But Princess Yue shook her head, fearing all was lost as she said, "It's over."

Aang hung his head, feeling the weight of both anger and guilt over the moon spirit's death. Momo jumped off the boy's shoulder as if knowing that something was coming. Knowing that there was a way, his tattoos glowed, and opened his glowing eyes into a stern gaze as he said with the voices of his past lives, "No, it is not over."

He started to move into the pond. Katara tried to stop him, fearing that he could lose himself again, but both Iroh and Nat stopped her. They all watched as the Avatar walked into the middle of the pond and stood still with his fists together. The ocean spirit circled the bridge before moving to where it floated in front of him. Aang's glowing expression was a stern one as it somehow met the gaze of the ocean spirit. The eyes and head marking of the Ocean Spirit's Koi Fish's from glowed as well to right the terrible wrong. Everyone watched in amazement as the glow intensified within the pool. Aang remained still before he sank into the pond.

A blue glow spread from underneath the oasis, giving the gloomy darkness a little more color. The glow continued to grow throughout the entire Northern Tribe.

Thor, having been keeping his team of warriors and benders protected as best as he could, looked up as the blue glow spread. Cap and Bucky also looked up from their battle to see the glow.

Back in the oasis, the whole group looked to the right as something moved through the water under the bridge and into the water way. When the thing reached the end of the water way, it started rise up and take form of a giant water spirit with the head of the Koi Fish and in its heart Avatar Aang. Clawed hands extended from the manifestation's torso as Aang lifted the arms. Everyone, friend, foe, warrior and citizen all stared in awe at the sight.

Aang made the manifestation around him move through the Northern Water Tribe palace and down the stairs. As he came by the water ways, he would pass by warriors and benders from both sides. The Water Tribe would bow in respect while the Fire Nation and Hydra all readied their weapons, but they wouldn't get the chance as Aang used a wave of water to wash them away. Then he moved on further down the hill. With waves of his arms, Aang's manifestation was able to wash away the enemy forces easily. But as he went down further, the manifestation's face was struck by a fireball. With another wave of his arms, Aang's manifestation was able to sweep more soldiers and tanks away. The Water Tribe warriors and benders he left alone as he passed by the streets. The Ocean Manifestation came upon Thor's group and glanced down. While the Waterbenders fell onto their knees and faces, Thor was still respectful as he dropped down on one knee. The Ocean Manifestation unleashed another wave of water to wash away the soldiers that Thor's group had been dealing with. The rest of the soldiers started to retreat back to the ships. The Ocean Manifestation then lowered itself into the water and moved down to the canal to the ocean.

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Back at Cap and Bucky's fight, the two super soldiers had stopped fighting. Cap removed his helmet to show his fiend his real face. Steve then asked, "Bucky, did you know of Zhao's goal."

"No." The Winter Soldier shook his head, honestly not knowing how far the admiral would have gone. Steve then said, "Do agree with what Zhao has done? Do you agree with this madness?"

This caused the assassin of Hydra to think really hard about his choice. Then he looked his old friend in the eye and said, "No. I would have stopped him."

"I know you would have." Steve nodded. Taking slow steps towards his friend, he asked, "Will you help me," Then he added, "help us, stop the Fire Nation."

Bucky looked down to the Steve's hand as the super soldier extended it to him. Bucky softly smiled and took it with a firm grip. The sound of yelling caused them to look for the source. Bucky listened closely and heard it, "It's Zuko."

"And it sounds like he's engaging Zhao." Steve assumed. Bucky then said, "What say we go help out."

Steve smiled and the two quickly ran to pick up their things before running off.

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Admiral Zhao jumped off one wall and ran along a path. But before he could go any further, a fireball rushed past him and demolished a totem made of ice. He shielded his face from the debris before looking behind him on the wall. Looking to the top, his eyes widened when he saw Prince Zuko standing there. He was completely surprised as he questioned, "You're alive?"

"You tried to have me killed!" Zuko angrily shouted as launched a fireball at him. Then with a quick motion of his hand he launched another. Zhao quickly moved out of the way as the fireballs impacted the wall where he once stood. Rolling to where he stood, Zhao prepared his own stance and then admitted it with a glare, "Yes, I did."

Prince Zuko walked through the smoke as Zhao said, "You're the Blue Spirit. And the Winter Soldier not doubt is the Red Spirit. Enemies of the Fire Nation." Then with an accusing finger as the Ocean Manifestation moved to the ocean, "You freed the Avatar and an Avenger."

"We had no choice." Prince Zuko said, speaking for both him and Bucky. Then he sent a flaming kick in Zhao's direction before following up with a fire fist. Zuko unleashed two more fire fists while Zhao was able to block and cut the flames with his hands like he did during his and Zuko's Agni Kai. When the flames ended, Zhao removed his ruined cape and said, "You should have chosen to accept you failure, your disgrace." Prince Zuko looked as if he didn't regret anything as Zhao then said, "Then, at least you could have lived."

Then he threw a fire fist of his own. Zuko was able to move out of the way of it and another while moving closer to the admiral. He jumped over a flaming sweep kick and the two moved around each other as Zhao stood back up. Zuko blocked a fire punch as the flames streamed from Zhao's fist. Zhao was quick to move out of the way of a fire punch to his midsection and used a flaming slide kick. Prince Zuko was able to jump over it. But a sudden normal sweep kick knocked the prince off his feet. Zuko rolled over and gasped when he saw that Zhao was ready to end the fight. But before he could launch an attack, Zhao grunted as a blur hit him in the chest before knocking him back. Both Zhao and Zuko looked to see Captain America and the Winter Soldier running up. Zhao gritted his teeth and angrily questioned, "How many traitors will there be tonight?"

"At least we're not destroying the world." Bucky shot back while raising his rifle. Then firing a few shots at the admiral's feet made Zhao back up as he jumped to avoid the shots. Zhao looked between the three of them, knowing that though the odds were against him he would fight to the end. Holding both hands pressed together over his head, the admiral unleashed a wave of fire. Prince Zuko was quick to act as he jumped up and sent a fire blast of his own that caused both attacks to cancel out. Both Cap and the Soldier jumped up into the air before delivering a good punch to Zhao's face. Zhao grunted as he fell back, but spun around on his hands while creating a wall of flame. Both Captain America and the Winter Soldier jumped back while Prince Zuko quickly jumped in the middle and launched a double fire fist at his foe. Zhao was quick to move out of the way and follow up with a high fire fist of his own, but Zuko was quick to avoid it by ducking and unleashing a blast at point blank. Zhao screamed from the heat as he fell off the wall. Prince Zuko, Captain America and the Winter Soldier all jumped down after him as Admiral Zhao picked himself up and ran.

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Back at the oasis, Iroh gently laid the body of the Moon Spirit's mortal form back into the water. Katara sounded truly sad as she said, "It's too late." Her, Iroh and Natasha all looked to the spirit as she said, "It's dead."

"What we need is a miracle." Nat shook her head, fearing that the battle might not go so well. They all hung their heads in sorrow before Iroh glanced over at Yue and quickly noticed something about her. He sounded hopeful as he said, "You have been touched by the moon spirit."

Yue hadn't moved while Sokka looked to him as Iroh reminded her, "Some of its life is in you."

"Yes." Yue nodded, "You're right. It saved me by giving its life." Then she knew what she might be able to do, "Maybe I can give it back."

This caused Sokka's eyes to widen and he said, "No." He grabbed her hand and argued, "You don't have to do that."

"It's my duty, Sokka." Princess Yue said, knowing what was right, even if she didn't want to. Natasha then said, "Not to make it sound mean or anything, but maybe this is like some kind of test."

They looked to her as she said, "That story you told us, about how the moon spirit saving your life. Maybe it foresaw how it might need you one day."

"You could be right." Princess Yue agreed, not fully knowing herself. But Sokka was completely against it by saying, "I won't let her." The princess looked to him as he said, "I won't let you." His grip on her hand tightened as he said, "Your father told me to protect you."

"But she has to protect her people." Natasha begrudgingly said, not liking to have to sacrifice a friend either. Princess Yue was in full agreement as she closed her eyes and said, "I have to do this."

Then putting on a brave face, her hand slipped from Sokka's grasp. Sokka could only watch in slight sadness to her sacrifice, but knew that they were right. Princess Yue kneeled down as Iroh once again removed the Moon Spirit from the pond. He held it up to her while Natasha said, "You're doing a very brave thing here, Princess Yue. And I'm sorry."

"We all are." Katara said, feeling sadness for her friend. Princess Yue gave a weak smile as she said, "Thank you, for all that you've done."

Then gently placing her hands on the fish's body, it glowed as the life given to Yue passed back into itself. Princess Yue's eyes closed as she could feel her own life fading while the moon spirit regained its own. The glow soon stopped and Princess Yue let out a sigh as she passed on. Sokka ran up to catch her and shouted, "No!"

He checked to see if she were truly, and sadness creeped into his heart as he said, "She's gone." He held her close and looked as if he were going to cry as he repeated, "She's gone."

Katara, Natasha and Iroh all hung their heads for the loss of the princess.

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The Fire Nation ships began to raise their ramps to their bow positions as they pulled back from the wall. The Ocean Manifestation came gliding through an opening between the wall. As it started to rise up, the bulk of the manifestation caused the flagship and the two beside it to bob a little. The hands of the manifestation reached out as the rest of it rose up and placed themselves on the decks of four of the ships. Then with a simple motion forward, both ships were pushed back. The ships were sent speeding back through the water and grazed a few other ships as they went by.

Aang moved the Ocean Manifestation before moving the right arm to block a fireball from a Firebender from the top of an observation deck. Then raising the other arm, the manifestation sliced through the tower with ease. The soldiers, whether they be from the Fire Nation or Hydra, cried out as they fell into sea below. Soldiers ducked as the manifestation destroyed catapults, parts of ships and towers as the manifestation powered through the invasion force. The Ocean Manifestation raised its arms to create a large wave that pushed the entire fleet back. The soldiers held on for dear life as the manifestation lowered its arms. The wave it created pushed the ships further out to the sea and the Ocean Manifestation followed after them. Aang moved the manifestation's head to see the remaining ships as they were sitting before icebergs. The manifestation moved to continue its job.

From the wall, Thor ran up to watch as Aang was doing what he could not. With a nod, Thor raised Mjolnir and said, "May you have the strength of the All-Fathers, Avatar Aang."

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Iroh, Natasha and Katara sat around Sokka as he cradled Princess Yue's body in sadness. The princess' body started to fade from Sokka's arms, and when he opened his eyes she fully vanished. The other three looked in surprise before the Koi Fish in Iroh's hand started to glow. All four of them stood on their feet as he moved to place the fish back into the pond. Sokka looked down at the Koi Fish with a mixture of sadness, anger and guilt. The oasis pond started to glow as a white light filled the water. A spiritual mist rose from the glowing water before taking on the form of Yue's spirit. The spirit of the princess' eyes trembled with equal sadness as she looked to the one she truly loved and said, "Good-bye, Sokka." She came up to him and placed her hands on both sides of his face and said, "I'll always be with you."

Then she pressed her lips against his and he did the same as he kissed back. But it didn't last long as she faded into the Spirit World. Sokka opened his eyes when he felt that she was no longer there. Sokka looked up into the sky with great sadness. They all looked up into the sky as the moon reappeared in its place in the sky, returning light to the land. Natasha came up behind him and said, "I really am sorry, Sokka."

Sokka just hung his head in great sadness.

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The sky returned to its normal self over the Ocean Manifestation as it prepared to finish off the battle. But as it moved to fight, Aang made it look up to see that the moon had returned in the sky. Knowing that there was no more cause for battle, the manifestation started to sink beneath the waves. Thor, worried, shouted, "Aang!"

But he didn't have to worry as the manifestation came up to a spot on the wall and extended itself to the top. The Ocean Spirit released Aang before the extension sank back. Aang's tattoos stopped glowing and he clutched his head. He looked to his right when he heard, "Aang!"

Aang watched as Thor jumped over to him and landed with a loud thud. The prince of Asgard came up to him and smiled as he said, "You are full of tricks, aren't you?"

"Yep." Aang smiled back. Thor wrapped his arm around Aang before twirling Mjolnir very fast. Then holding on to the strap as he let go, both he and Aang were whisked off the wall.

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In another section of the city, Zhao was defending himself from Prince Zuko, Captain America and the Winter Soldier. He moved out of the way when the Winter Soldier brought down a fist. The fists impact created a large crack. The admiral tried to land a fire fist, but Cap's shield knocked his hand off course. Prince Zuko then came in with a flaming high kick. Zhao was able to disperse it, but Zuko then came in with a huge blast at point blank again, causing the admiral to stumble backwards. With a few more flows of fire, Zhao screamed as he was once again knocked off of his feet.

Looking up to the sky above them, his eyes widened at the sight of the moon back in the sky. Feeling as if he had been cheated he shouted, "It can't be!"

Captain America and the Winter Soldier both looked up to see that the moon was indeed back. Cap then said, "Looks like everything's gonna be alright."

Unbeknown to any of them, the Ocean Spirit moved through the waters of the canal before reaching up to the bridge. All four fighters looked up to see the hands made of water reach over the sides and down to them. Cap, Bucky and Zuko moved out of the way while Zhao was ensnared. Zhao struggled to break from the spirit's grip. Zuko, though having the right to despise Zhao, knew that he wouldn't leave one of his countrymen to die. He ran up to the edge just as the hand was about to pull Zhao under. Reaching for him he shouted, "Take my hand!"

Zhao looked as if he wanted to, but when he thought about being saved by the banished prince, he pulled his hand back. The Ocean Spirit dragged Zhao under the water, drowning him to end his evil. Zuko, Steve and Bucky all looked down to the water where Zhao was as the last of the light faded. But before anything else could be done, a blue light came from underneath Bucky. Both Steve and Prince Zuko looked and gasped as a portal appeared underneath his feet. Bucky cried out as he fell through while both Zuko and Steve rushed forward and cried out, "Bucky!"

But before they could try and grab his hand, Bucky disappeared through the portal and it closed on the spot. Steve fell to his knees as he looked to the spot, tears starting to well up in his eyes. With an angry yell, he pounded the ground in anger of not being able to help his friend again. Prince Zuko, not knowing of the captain's feelings, quietly backed away.

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Iroh carefully made his way from the oasis, after have being let go by the Avatar's friends. He ran down a street as he searched for his nephew. As he came to an intersection, he bumped into someone. Both of them landed on their backsides with a thud. They looked up and a joyous face came upon Iroh as he said, "Zuko!"

"Uncle." Zuko said before Iroh rushed up to him and embraced him which Zuko gladly returned. Zuko and Iroh released each other as a look of sadness came up on the prince's face. Iroh noticed this and asked, "What is wrong, my nephew?"

"He's gone." Zuko said, feeling ashamed about his friend, "Bucky's gone. Taken by a portal. He could be anywhere."

"Oh." Iroh said as he hung his head, sad for the loss of their friend and not being able to comfort his nephew at the moment. The sounds of rushing feet caused them to look up and keep moving.

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At the Hydra base of operations, the Bucky, the Winter Soldier, yelled as he dropped down onto the floor. When he stood up he noticed that he was surrounded by a group of individuals. His eyes widened when Johann Schmidt stepped forward. The leader of Hydra didn't say anything as he signaled for a few others. Bucky grunted as he was struck in the back of the head and fell to the ground. He heard the Red Skull order, "Restrain him."

The next thing he knew was that he could feel someone grabbing his real arm. When he was on his feet, he looked Johann Schmidt in the eyes as the Red Skull then ordered, "Put him in deep freeze."

Bucky's eyes widened and he started to struggle to get out of their grip, but whoever had him was a bit too strong. He yelled as he continued to struggle while being led through some doors.

When they were gone, Johann Schmidt then said, "Prepare to head to the Fire Nation capital. We must have an audience with the Fire Lord."

The individuals nodded before heading out.

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The next morning, Master Pakku, Katara, Chief Arnook, Natasha and Sokka stood outside the palace and overlooked the damage from the last two days. Without looking back, Master Pakku said to Katara, "I've decided to go to the South Pole. Some other benders and healers want to join me." Turning to his best pupil he said, "It's time we helped to rebuild our sister tribe."

"What about Aang?" Katara asked as she looked over to the Airbender. He stood with two of the three Avengers and Momo as they too looked to the horizon. Then she pointed out, "He still needs to learn waterbending."

"Well," Master Pakku said as he turned back to her, "then he had better get used to calling you Master Katara."

Katara smiled in appreciation to this before turning her gaze back to Aang.

Chief Arnook and Sokka looked up to the moon as it started to set. The chief of the Northern Tribe told Sokka, "The spirits gave me a vision when Yue was born." He looked and sounded sad as he said, "I saw a beautiful, brave, young woman become the moon spirit." He took a deep breath before saying, "I knew that this day would come."

"The spirits knew that she would have a large role to play." Natasha said, making sure not to disrespect her. Sokka then looked to the chief and said, "You must be proud."

"So proud…" Chief Arnook admitted, "and sad."

"But don't worry." Natasha told him. They looked to her as she repeated, "She'll always be with you."

Both Sokka and Chief Arnook smiled in appreciation to her. Placing a hand on Sokka's shoulder, she led him over to Aang.

Thor, Steve, Aang and Momo stood side by side as they went over what happened. Aang then recounted, "So, Bucky's been taken again?"

"Yeah." Steve said as he looked down. Aang then held his staff tight as he then said, "Then we'll be sure to look for him too." He glanced over to them and said, "As well as the other Avengers."

Both Steve and Thor nodded to this.

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Out on the sea, a small raft made from parts of destroyed parts sailed by the wreckage of the destroyed fleet. As he managed the sail, Iroh then said, "I'm surprised, Prince Zuko…" He glanced back as his nephew gazed out to the horizon, "surprised that you are not at this moment trying to capture the Avatar."

He quirked a brow to see what Zuko's reaction would be. But all Zuko could do was sit down and say was, "I'm tired." Then he looked down to the water and admitted, "Plus, I don't know if I can do it without Bucky."

"We may see him yet again, Prince Zuko." Iroh reassured as he walked over to the exhausted teen. Then like any father would, he gently said, "But for now, you should rest." A smile came on his uncle's face as he said, "A man needs is rest."

Iroh backed up while Zuko laid on his back. He gazed up into the sky and began to think about the future. Then he decided to let sleep overtake him.

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Aang, Steve and Thor all stood at the edge of the platform, gazing out to the horizon. Katara stood behind them and Aang turned to her. The two friends embraced each other while the two Avengers looked to them. A chirping Momo caused them to look down to see him giving them a wanting-to-join look. Katara smiled as she said, "You too, Momo."

The lemur jumped onto Aang's outstretched arm as he said, "Come here."

The lemur ran to Aang's other shoulder while Sokka placed a hand on Aang's free one. Natasha leaned against Sokka while both Steve and Thor stood behind the group. They all looked out to the horizon as Appa floated up next to the platform, knowing that whatever came their way in the future, they would face it together.

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Back in the Fire Nation, a summons had been made for the Fire Lord's chamber. Kneeling before the ruler of the Fire Nation was a young woman in royal Fire Nation armor. The Fire Lord then addressed them, "Iroh is a traitor. And your brother, Zuko, is a failure."

She looked up to him as the Fire Lord told his daughter, "I have a task for you."

"And we have a gift to bestow upon you." Johann Schmidt's voice said from behind. Both the Fire Lord and the princess looked back to see the Red Skull walking into the room. Behind him were the Abomination, the Scarlet Widow, the Destroyer Armor, Rumlow, Justin Hammer in his suit and Arnim Zola. Johann Schmidt then advised, "They will be great assets to you, princess."

The Fire Nation princess only had a grin on her face as she felt that she was more than capable of completing her father's mission.

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This story's dedication to:

Stan Lee: 1922 – 2018

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Author's Note: Man, this is my longest chapter for this story. Not to mention that I've only scratched the surface of this story. But Book One is almost complete. Just one more piece and I will be ready to move on to Book Two. And I do apologize about what happened to Bucky and again I apologize to tell you that he won't be in Book Two, only in reference or flashbacks. Keep on voting on who think you might be seeing next. I look forward to reading your reviews. Be sure to leave a comment either about if I've done something wrong or if you want something specifically to happen. See you next time.