Disclaimer: I do not own Rise of the Guardians or Phineas and Ferb

A/D Jack didn't quite know what a center was, but he understood that it had an important meaning to his other self and the Guardians. They all seemed to be stunned to hear Jack say that, enough that they were no longer threatening any of them. "Alright, we will deal with Pitch first. Then we will figure out what to do with you two rascals." Bunny grumbled, getting annoyed with having to work with two Jack Frosts.

"Aw, just as friendly as ever aren't you Bunny." Jack said sarcastically, recognizing the Guardians grumpy attitude.

"Shut up!" he complained, walking off and trying to put some space between himself and the winter spirit.

"Do you always annoy him like that?" A/D Jack asked, thinking it looked fun but not joining in yet. He didn't know the Guardians, not like this Jack.

"Of course, why do you think I call him kangaroo?" Jack asked, grinning and feeling slightly disappointed that Bunny was too far away to hear the comment.

"Okay, I've got it open for you. Just go on through and you will be home." Baljeet was saying, waiting for the boys to return to their backyard.

"So, that's the other dimension? What are children like over there? Do they remember to floss once a day? Do they brush their teeth every night and then again in the morning?" Tooth was asking, making Jack laugh.

"Same as ever, Tooth." Jack replied, glancing at the boys before he heard the news on the television. It was about their pet, the one he had seen for just a few moments during his first encounter with this world's Pitch Black.

"Oh no." Jack whispered, knowing the boys would never leave now. The argument that started was only proof of that. "Sorry, I've got to help them. I can't just let them deal with this on their own." Jack told them hearing that they would be going to save their pet.

"Pitch might be there, actually. He is trying to gain belief in adults now." A/D Jack told him, knowing Pitch wanted to start with Dictator Doofenshmirtz.

Tooth had just noticed something about Jack 1, though, something she should have noticed sooner. "Oh my gosh, look at your teeth! They are so white! Doesn't it just lift your heart to see how they sparkle?" she asked, shoving her hands in the boy's mouth. Jack felt uncomfortable, knowing he should have expected this to happen. A/D Jack was laughing his head off, now realizing why Jack had warned him about Tooth and her obsession with teeth.

Jack pulled away, rubbing his jaw and sighing. "Yeah, I get it, they sparkle like freshly fallen snow. We really don't have time for this, though, Tooth. These kids need our help and right now, they are your only believers. We didn't exactly spread belief across the globe like you guys do." he told them.

"Right, sorry. They're beautiful." she added, deciding to keep his simile in mind. It worked so well to describe his teeth, especially when you considered that he was a winter spirit.

"Thanks for the help, Frosbite." Jack said sarcastically, glancing at his other self and knowing Bunny would appreciate the insult.

"Frostbite? That's a good one, mate. I might have to use that one myself." he commented, earning himself a glare from A/D Jack.

"Now you know where I got that nickname from." Jack said with a grin, earning himself an eye roll from A/D Jack.

"Fine, we're even for now." he replied, following the kids into the cart.

"Wait, you're coming with us?" Phineas asked, surprised to see all of the Guardians following them.

"According to Pitch's ex-partner, there is a good chance of him showing up around Doofenshmirtz. We need to go to keep you guys safe." Jack explained. That was when he noticed the new girl in the cart, the second version of Candace. "When did she get here?" Jack asked, but no one bothered to explain.

"We don't have time for this. Let's move out!" A/D Candace yelled, starting the ride.

"This is so boring!" A/D Jack complained, something that Jack found himself agreeing with. Slowly, Jack began to get an idea, a way to make this ride just a bit more fun.

"You're right, Frost, this is boring. Time to make things a bit more entertaining!" Jack yelled, spreading his arms wide and bringing snow into the mine carts.

"Snow? How is it snowing underground" Candace asked, glancing at her brothers for an answer.

"Well, we forgot to mention that Jack Frost is helping us, along with Santa, the Easter Bunny, the Tooth Fairy, and the Sandman." Phineas said, knowing how ridiculous it sounded.

Candace blinked a few times, not knowing how to respond to that explanation. It wasn't exactly bustable, and she couldn't really see it as being true. Meanwhile, Jack Frost was getting a snowball ready to throw at his other self, deciding that nothing could be more entertaining than a snowball fight with himself. "Alright, this is gonna be a free for all until we reach our destination! Frost, you're going down!" Jack yelled, throwing snow at the other Jack Frost.

The kids had gotten used to Jack's playful attitude and quickly joined in, throwing snow at the winter spirit and each other. "No, I'm not playing. I'm resisting this snowball fight!" Buford yelled, sitting down in the cart and crossing his arms. Of course, a comment like that caught the attention of both winter spirits.

"Would you like to do the honors?" Jack asked, glancing towards his other self. A/D Jack nodded, creating a snowball and blowing air on it, covering it with a layer of frost.

"What is he doing?" Jamie asked, curious to know what it was.

"Watch, it is a special kind of magic we both have. Trust me, Buford won't be resisting us for long." Jack told him.

The snowball hit the boy right in the face, something that the others thought would anger the bully. Instead, Buford began to smile, laughing and making a snowball of his own. "Who threw that? You wimps are going down now that Buford's playing!" he yelled, throwing snow at all the children in the cart.

"Whoa, how did you do that?" Jamie asked, amazed at Jack's magic. A/D Jack chuckled, ruffling the kid's hair. How had he ever thought that fear was the way to gain belief? This was so much better, having fun and making kids laugh.

"Sir, we're nearing the target." Isabella said, stopping the fight and staring in front of them.

"Ugh, we wasted our time. We needed to discuss strategy and instead we spent it playing games." A/D Candace complained, glancing again at her brothers. How they had snuck in here was a mystery, but she wasn't going to deal with it now.

"Okay, change of plans, this is as far as we go." she announced, stopping and deciding to protect her brothers first.

"We're not gonna help them?" A/D Phineas asked, upset that he had come all this way for nothing. Both the Guardians and their clones were depending on them to save this world. Candace just didn't understand that they could help instead of staying at home all the time.

"Look, this isn't our fight, it's theirs, and you two shouldn't have gotten involved. Maybe none of us should have." she said, looking thoughtful for a moment before getting ready to leave.

Jack Frost was staying close to the boys at the front of the group, seeing the darkness ahead. "Be careful, Pitch and his nightmares could be anywhere within this darkness." he told the boys. A/D Candace hesitated, hearing what Jack had said.

"Dark?" she asked, knowing something wasn't right , lights come on and surround all of them, revealing tons of norm-bots and both Doofenshmirtzes in the room.

"Ta da! It's a trap!" Doofenshmirtz yelled, getting excited about their plan.

"I think they get that." A/D Doof said, annoyed with his other self. Things just kept getting even more annoying every day with this idiot. He didn't know how much more he could take. Behind them, both Pitches were watching the scene in front of them.

"No, it can't be." A/D Pitch whispered, seeing who was getting outside of the mine cart. The Guardians were here, alive and well.

"I destroyed them! How are they alive?" he asked, but Pitch wasn't listening. He was tired of this world, of all its fear and darkness. Yes, it was exactly what Pitch created, but this was too much. Children did not speak to him and his life was no better in this world than it was back at home.

"What is the point? Why are you trying to spread so much fear anyway?" he asked, finally unable to stop himself from asking his question. Jack hesitated, hearing that question. The Pitch he knew would never question spreading fear. Something must have changed without him knowing about it.

"To gain more power! I will not let those puny Guardians stop me, no matter what. Children will believe in me and only me, no one else!" he yelled, announcing his intentions.

Pitch knew that this was not what he wanted, not in any form. "Oh, just you? Perhaps a certain winter spirit would like to have a word with you then." Pitch commented, glancing towards both boys in the mine cart. "Jack, I know we have our differences but-" Jack cut him off, grinning at his old enemy.

"Yeah, I know. Let's take this guy down and then get out of here." Jack told him.

"Wait, hold on just a second. You want me to work with Pitch?" Bunny asked, not accepting this in any way.

"Go back to your warren if you don't like it, Bunny!" Jack yelled, holding his staff out towards Pitch. The boys had already began running away with their pet.

"Sandy, follow them and make sure they stay safe!" North ordered, sending away the golden Guardian.

"As long as you promise to leave the children of this work alone, we will fight by your side." North told Pitch, feeling wary of the dark spirit. Pitch nodded, feeling strange but knowing that somehow this was right.

"Jack, what combination goes together better than anything else?" Pitch asked, glancing towards the spirit and hoping he could remember something as simple as their previous conversation. Jack grinned at him, holding his staff ready to fight.

"Just tell me where you need me to fire." he said.

Pitch nodded, sending a blast of sand towards his other self. A/D Pitch glared at his other self, angry at the betrayal but willing to take revenge. "Jack, now!" Pitch yelled, knowing that his other self would disappear into the shadows. His sand would follow him, however. If Jack froze it at just the right moment, it would interrupt A/D Pitch's vanishing act and force him to stay and fight. Hearing his cue, Jack sent a blast of ice towards the king of nightmares, following the dark sand. As the sand moved, it began to freeze in place until it finally froze Pitch to the ground.

"No! I will not be defeated, not by the likes of you!" A/D Pitch yelled, struggling to break free of the ice.

"This isn't over, the fear here makes him strong!" Pitch warned, knowing from experience that it was true. Almost immediately after his words, a swarm of nightmares arrived to free their leader, breaking the ice apart and freeing the other Pitch.

"Oh boy, that's a lot of nightmares." North said, his eyes growing wide as he stood ready to fight.

"Well, you're about to see a few more." Pitch told them, bringing some of his own nightmares to the fight. Black sand collided with itself, horses biting at each other and exploding into piles of dust as they were destroyed. North would destroy others, swinging his swords to defend himself and stop the army. Bunny's boomerang would fly above everyone, slicing down the reinforcements that A/D Pitch would call to the fight.

Tooth was also fighting her hardest, lashing out at any nightmare that dared to approach her. Her punches hit them hard, as well as any strikes they received from her wings. Her flight gave her an advantage, allowing her to dodge their attacks and maneuver around to their weak spots. Even so, they did not seem to be gaining any ground against A/D Pitch Black. "Give it up, Guardians! You are no match for me." A/D Pitch yelled at them, staying safe in the background.

"No way! I am not letting you take away the belief that I've worked so hard to get!" A/D Jack yelled, sending a blast of ice directly towards the boogieman. He vanished in a cloud of dark sand, laughing as he did so.

"Is that so? Do you really think that they'll ever accept you? That they'll ever forgive you for what you've done? You are Jack Frost, bringer of blizzards and misery wherever you go. You make a mess of everything." A/D Pitch was saying, making both Jack's grow angry with him. A/D Jack was actually shaken up by his words, though, feeling the impact of what he was saying for the first time. Jack 1 had heard something similar before, but he was determined to make this different this time.

"You are wrong. Jack Frost does not make a mess of everything. As a matter of fact, he does an excellent job of enhancing the darkness we create." Pitch told his other self, defending the winter spirit and surprising both of them. "They might be afraid of losing belief, but you are no different. All of us have fear. We are meant to help children move past their fears, not force them to live through them." Pitch said, suddenly realizing the truth. This was why he was a spirit, what he was meant to do. Fear might be his center, but he could use it to help children instead of harm them.

"Help children? Oh, don't tell me you are thinking like a Guardian now. The mighty Pitch Black, fallen to the status of a lowly Guardian? It is unbelievable. In fact, I cannot allow it to happen, not in this world or any other." A/D Pitch announced, glaring at his other self. "In fact, your advantage is about to vanish. Take a look in the other room and see what is about to become of your precious believers." he told them, revealing the monster that the children were facing.

"Jamie!" Jack yelled, seeing the kid chained up with the Phineas and Ferb from his world. There was no way he would let any of them die, not if he could help it.

"Oh no you don't! I'm not letting anyone save them, not until I've had my fun." A/D Pitch said with a laugh, blocking Jack with a wave of nightmare sand.

"Pitch, let's try this again." Jack said, determined to not lose again.

Turning around, Jack saw Sandy join them as well, with a sad look on his face. "It is alright friend, you did your best." North said, patting the Guardian's back.

"Sandy, you can help too." Jack said, getting an idea. Dream sand didn't mix well with Pitch's darkness, but maybe with his frost added in they could create something amazing. Together, the three of them would stop A/D Pitch. If they couldn't, then all hope truly would be lost. Taking one last glance towards Phineas and Ferb, Jack flew over towards Pitch and Sandy, preparing one final attack to stop A/D Pitch once and for all.

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