Just one more day until the final day. This is going to be my favorite piece to work with. Once again I ask that you read and enjoy today's Zutara Week fic

Alternate Universe
The Universe in question is the Halo Universe, and the fic takes places years after "Pain"

Katara-019 was nervous, but she was trained to not let her emotions get in the way of the mission. She along with three of her fellow SPARTAN IIs soldiers were on the UNSC LAST AIRBENDER, a Destroyer-class ship en route to the planet New Harmony, which was under siege by Covenant forces. As they were in the ship's Armory, Katara checked her gear, she was the Team's field-medic and had on various supplies to treat any injury. As she checked the levels of the Bio-foam cans, she heard the clicking of weapons opening, her fellow SPARTANS were checking gear as well. Each of them were 26 years old and have the rank of Chief Petty Officer 2nd Class, but she still saw her close friends as the same group of kids that always hung out together.
Aang-004, the Team's best Sniper and Scout. He had great aim out of the 4 of them and his speed rivaled Kelly-087's, he could dodge any shot fired at him. He also worked well in zero gravity, whenever there was a situation that involved deep space, Aang volunteers to go EVA in a Booster Frame and face the threat head on.
Toph-026, Heavy Weapons specialist. Despite her small frame, she could carry both a Jackhammer rocket launcher and her favorite, Nicknamed the Spartan Laser, which can shoot a high-powered laser burst, and was well known to fire these two at the same time. She also has skills with grenades, always hitting her mark, she never let the handicap of being blind stop her, of course this was moot sense her helmet's visor is integrated with her old Vision Visors.
Zuko-032, the forth member of their team and their squad-leader. A smart strategist, Zuko always took the lead on any attacks, He could use any weapon, including Covenant weapons, and had skills with a combat knife that rivaled Fred-104's, of course his habit of taking the lead had nearly cost him his life. one mission a few months back, an Elite got a lucky shot and fired its Plasma Rifle, hitting the left side of his face, and his helmet was knocked off at the time. The red scar left behind would be a reminder to all of them how ruthless the Covenant could be. As they finished loading up and checking their gear, the AI of the ship appeared on one of the Holo-projectors that were displayed throughout the ship. The Smart AI's Avatar depicted an elderly Asian man in red robes and a small topknot on his balding hair.

Katara: Greeting Iroh.

The AI, Iroh, Bowed to her.

Iroh: And to you Spartan-019. You'll be happy to know that ETA to New Harmony will be in another 15 minutes, we are beginning our exit from Slip-space.

Zuko: Thank you, Iroh. We'll meet up with the other marines soon.

Iroh: I'll inform Commander Zhao.

With that, the hologram of Iroh fades away. Toph is the first to rise, strapping both of her weapons on her back, The magnets attached to the back of the armor kept them intact.

Toph: You heard the man, stop sucking your thumbs and lets get ready to make our entrance.

Aang: I'm set. Let's show these Covenant bastards what we're made of.

Aang straps his weapons on and puts his helmet on unlike most of the SPARTAN IIs whose Mjolnir Battle Armor were regulation Olive-drab green, these four Spartans decided to custom-color them: Aang's being gold-orange with cobalt blue, Toph has emerald green with beige, Zuko has red and gold and Katara's armor is both light and dark blue.
Aang and Toph start to leave, Katara starts following them but is stopped by Zuko's hand, Toph noticed the two not following.

Toph: Hey, you guys coming?

Zuko: We'll be there, just give us a few minutes.

She nods and continues her way out, leaving Katara and Zuko Alone.

Katara: So, what's up Squad-leader?

Zuko: Nothing, just wanted to have a bit of alone time.

She smiles, Zuko always did this just before they started their mission. Without another word, she wraps her arms around Zuko's neck and started kissing him. His arms wrap around Katara's waist and he kissed her with the same level of passion. After recovering from their Augmentation, the two started to spend as much time as they could together, doing their best to stay hidden from the others. They pulled away but kept their foreheads touching.

Katara: So...is my Spartan boyfriend ready to kick some Covenant ass?

Zuko: I'm always ready to fight...for earth, her colonies...and you, my love.

They shared another kiss before their com-links started beeping, we hear Toph.

Toph: Hey guys when you're done sucking face, can we get this op underway?

The two pulled back and blushed.

Katara: (into com) We're on our way, Toph.

Toph: Got it. Oh, and Sugar Queen?

Katara: What?

Toph: Now we're even.

Katara laughed a bit at that, she remembered doing the same thing to Aang and Toph a long time ago.

Katara: Roger that Toph

With that, the two strapped on their guns and helmets and made their wait to meet up with their team.

Hours past on the Planet New Harmony, and the battle was just raging on. A battalion of marines charged at an oncoming battalion of Covenant forces: Grunts, Jackals and a few Elites, several marines manage to take the Grunts out, however their weapons only bounced off the Elite's and Jackals' energy shields. Two Elites with energy swords rushed at the surviving humans and sliced at them all without remorse, two more squads were firing at them but they tossed several plasma grenades, one made its mark on a poor marine's chest while the other landed in-between the rest, the grenades exploded, taking most of the humans with it. Suddenly, the sounds of an M12 LRV Warthog's engines grew louder and the Elites didn't have time to leave before they were mowed down by the jeep, purple blood was everywhere. Riding it were The four SPARTAN IIs, Aang takes his pistol out and uses its scope to take out the Jackals with precise hits. Toph uses the Warthog's Turret and starts firing at every alien coming at them, but suddenly, a fuel-rod blast hits the side of the jeep, turning it over, Toph jumps out of the way in time.

Toph: Oh crap, Hunters!

In the large army of aliens, we see two of the Giant armored aliens known as Hunters, they shot their Fuel-rod guns at the Spartans, who took cover behind the turned over Warthog.

Katara: Toph, you know what to do.

Toph: You bet.

She takes her Spartan Laser out and Aims at them. She waits until the two were both in her sights. She pulls the trigger and the Laser charges before firing, the blast of the laser shattered the two Hunters, their orange blood spilling everywhere.

Toph: Two in one, that's how I like it.

Zuko: Drop-Ships. Looks like their inviting more to the party.

We see hovering above were the U-shaped Covenant Drop-Ships, Spirits, as the compartments open, releasing more of their infantry, two had their small land-crafts called Ghost while another three had their tanks called Wraiths.

Aang: They brought their heavy weapons.

Katara: Fall back, fall back!

The four began to move back, firing at any Covenant near them, Zuko with his Battle Rifle while Katara with her MAB5 Assault Rifle. Toph, using both her rockets and laser, fires at the vehicles, the Ghost flipped by the rocket's explosions and one laser blast manages to hit a Wraith in the right place, destroying it. More marines arrived with more Warthogs and a few Scorpion Tanks, firing at the oncoming forces, but more just kept coming. Aang climbed on top of a tank and aimed his Sniper Rifle, picking off a few Elites and Jackals with Scopes and Carbine Rifles.

Zuko: (into Com) Commander Zhao, They're still coming, we need more troops.

Commander Zhao: Roger that Chief Petty Officer. Hell-Jumpers are in the tube.

Just after the commander said that, the sky became filled with what looked like shooting starts, in reality they were Drop-Pods, each with an Orbital Drop Shock Trooper, ODST, the USNC's Special forces, next to the SPARTANS II. Each pod hit the ground, some landed in front of the battle, taking a few Grunts and Elites with them, the doors popped and the Troopers started Firing. We focus on two pods that managed to land by the Spartan team, their doors open and we see two ODSTs exit, one of them was obviously female, they walked up to the Spartans.

Female ODST: I'm Suki, Field Grade Officer. This is Sokka, my Lieutenant, who's in charge here?

Zuko: We're all Petty Officers 2nd class, but I'm Squad-leader, so I'm in charge.

Suki: Well we're in charge now, Spartan, so you follow my orders. Is that clear?

A high level of tension was in the air as they spoke, this was felt every time they or any other SPARTAN IIs were near ODSTs. Ever since that incident with John and those four Hell Jumpers in that Gymnasium, there has been bad blood between the two fraction, however they put aside their differences for the sake of the mission.

Zuko: Sir, yes sir.

Suki: I prefer Ma'am, but I'm glad you understand.

Suddenly the ground began to shake.

Sokka: What the hell is that?

Aang: Uh...Sirs...we have a problem.

Through the Rifle scope, we see something big and purple crawling towards them. Aang Zooms and we see it clearly, a Scarab, one of the Covenant's Deadliest weapons.

Aang: They have a Scarab and it just touched down.

Toph: Damnit, I'm down to my last two rockets and my Laser had a low charge. I'm going to find more back to base.

Zuko: Do it. (to Suki and Sokka) Sirs, do any of you have heavy weapons?

Sokka: We don't...but I see one of those Split-faced bastards with a Fuel-rod cannon. I can get it.

Suki: What are you planing?

Zuko: We can take one of the Scorpion tanks and use it to take out the Scarab. With Spartan-026 getting rockets and your Lieutenant with a Fuel-Rod, we can take it out.

Suki: A high-risk...I expect nothing less from a Spartan. Alright, we'll try your plan. (to Sokka) Get that Cannon and try not to get shot.

Sokka: You know me (runs off).

Suki: That's what I'm afraid.

Aang, who was still on top of a tank, knocked on the entrance.

Aang: Marine, my team needs to use your Tank.

Marine: You got it sir.

The man climbed out, as did the other 5 men riding on the tank. Aang enters the cockpit, Katara takes the Turret, Toph returns at takes the lower left of the tank, Suki takes upper right and Zuko's upper left.

Suki: Let's get moving, Spartans.

Aang hits the acceleration and the tank starts moving. Meanwhile, we see Sokka charging with his Silenced Sub-Machine Gun, mowing down every Grunt and Jackal he sees. He reloads just in time to run into the Elite with the Fuel-Rod Cannon, He takes something strapped on his chest-plate, where his Combat Knife would be, and pulls out a blade. He throws it but the Elite ducks, putting aside the Cannon, the Alien draws its Energy Sword, charging at the ODST, he fires his gun, but the shields take most of the damage, it's shields finally fell but the Elite was ready to slice him. Just before he strikes, the Elite pauses and fell down lifelessly, at the back of its head was the blade Sokka threw, but it wasn't a knife, it was some sort of Boomerang blade. Sokka takes the Boomerang and the fallen Elite's Fuel-Rod Cannon, and just in time for the Tank to pass by. He jumps on the free spot on the lower right.

Suki: The Boomerang again?

Sokka: It never fails!

The tank continued plowing through the oncoming aliens, With the tank blowing up every Covenant vehicle, to its passengers taking out the infantry, they finally make it to the scarab. The walking tank spotted them and began to Fire, Aang manage to maneuver the tank away from the oncoming plasma bombardments.

Suki: CONCENTRATE FIRE ON ITS LEGS! IT'LL STOP MOVING!

Aang, Toph and Sokka aimed at one of the legs and opened fire. The purple shielding started to shatter off and they began to hit the joins. Once enough hits were made, the Scarab started to beep and alarm, then it began to kneel down.

Suki: Nice work! We got to head to the back, that's its weak-spot.

Zuko: I'll make the hole, Aang, you get to it and fire

Zuko climbs off and runs at the leg, he jumps with all his might and lands on the Scarab. Several Elites charge at him but he throws two grenade at the oncoming group, sending them flying. He grabs two fallen energy swords and makes his way to the rear of the tank. Once he saw Aang's tank make it, he sends his last two grenades and a few plasma ones at the shielding and it explodes, exposing the core. He was about to jump back in where he heard a nose. He draws the Energy Swords and blocks another coming at him, an Elite, coming out of its cloaking and wearing fancy sliver armor, faces Zuko, it spoke and Zuko's translators interpret what it was saying.

Elite: I will slay you Demon, for I am the Arbiter.

It draws another energy sword and tries to strike him, but Zuko jumps and dodge. The two begin to duel, one blocking the other, both moving with such skill and grace. However, because they were fighting right at the core, Aang, Toph, nor Sokka could get a clear shot.

Katara: Come on, Zuko Move...

Toph: The Scarab's getting back up!

They saw that the Damaged leg manage to self-repair and the walker began to turn towards the tank.

Suki: You in the Turret, help him. We'll keep the Scarab busy.

Katara nods and she exits the turret. Aang lifts the barrel of the tank and Katara uses it to jump on the Scarab's back. The Elite, now known as the Arbiter, turns and faces Katara, she fires her Assault Rifle, but it's shield and armor took most of the damage. The Arbiter charges at Katara but Zuko Jumped and countered, he then gave one of the Energy swords to Katara and she uses it as her own. The two SPARTANS clashed swords with this Arbiter, and it was able to hold its ground. Surprisingly, it manage to strike Katara's leg and she cried out in pain, Zuko blocked any other attack that came at her. Once the Armor's Bio-form injectors sealed the wound, Katara got back into the fight.

Zuko: This Elite is strong.

Katara: He is...but not strong enough.

They both charged at the Arbiter, its swords striking and their swords striking back, as it fought, the Arbiter didn't realize where it was being pushed back to. Zuko and Katara started to strike harder and harder, the Elite began to grow tired and was having trouble blocking until finally they sliced both of its hands off.

Arbiter: AAHHHH!

Zuko: It's over, split-face!

Arbiter: It will never be over! I will die, but a new Arbiter will take my place! Your destruction is the will of the gods! And we are their instruments!

Katara: Well tell your gods that these instruments are crap.

Katara kicks the Arbiter into the core, where the force of the impact caused it to explode. Warning sounds started to alarm.

Katara: We've got to get out of here!

Katara started to run, but fell over as she stepped wrong on her sliced leg.

Zuko: I'll get you out.

Katara: There's no time! Save yourself!

Zuko: We're not losing you like we did with Samuel.

Zuko picks her up bridal style and begins running, he makes it to the front of the Scarab, as he was running, blue flames popped everywhere and he made the jump just as it exploded, the force of the blast sent them further away. Zuko gets into a landing position and activates the Armor's locking system, the suit's gel-layers would take most of the impact. They hit the ground and Zuko's feet takes out a big chunk of the ground before they stopped completely.

Katara: Are you all right, Zuko?

Zuko: I'll be fine, what about you?

Katara: I'll live.

They both wanted to kiss eachother right then and there, but they couldn't in the battlefield, so they did the next best thing: Katara takes her two fingers and makes a smile drawing over the helmet where his mouth was, Zuko did the same with her, it was the Spartan's way of showing emotions, that they cared about eachother. Before they could continue, the Tank Aang was driving appeared next to them.

Suki: Great job out there, Spartans, but it's not over yet. Now get your asses in the tank and let's finish this fight.

Zuko and Katara: Yes Ma'am.

Zuko unlocked his legs and the two jumped back in the tank. This battle was still raging on, and they'll be more along the way in the upcoming future, but Zuko and Katara knew that they won't give up, they'll continue to fight, they'll fight for all of humanity...and eachother.

And there goes "Alternate Universe." Lots of action in this fic. Please let me know what you think of this, read and review