Disclaimer: I don't own Prototype or Adventure Time

I am think I might make this a series, you know, if I can keep getting ideas. Let me know what you think. Every bit of feedback helps.

Chapter 2

The Vault

Finn's POV

Alex lunged forward, faster than either of their minds could process. His fist slammed into Jake's face, sending him flying backwards.

"Jake!" Finn shouted

Alex rushed towards Finn, his fists raised. Finn, reacting purely on instinct, swung his sword up to block. He knocked Alex's arm to the side, but somehow it wasn't cut. Finn followed up with a few quick strikes at Alex's face, but he deflected them all. Finn raised his sword over his head and brought it down on Alex's face. Alex's hand shot up, and he blocked the swing with his forearm. The sword sank in a few centimeters, a single drop of blood ran down Alex's arm.

Alex smiled coldly, "Well, not bad kid." He then dislodged the blade and leapt back few feet. His right arm shifted and changed into a large blade, while his left arm became a shield. "Under any other circumstances, we might have been friends, but this fight is over." Alex dashed forward.

Finn and Alex traded blows for a few minutes, Finn unable to get past Alex's shield arm, and Alex unable to hit the much more skilled Finn. Alex never really got good at real sword-play, but his speed and strength more than made up for it. Finn was still fighting Alex when he began to tire. Alex swung his blade at Finn, who blocked with his own sword. The two were pushing against each other, swords locked, when Alex's left arm changed back from a shield and Alex gave Finn a right hook across the face.

Finn sailed backwards, further into the vault. He landed hard on his back, bruised but not broken. Then he saw Alex's new transformation.

His arms had shifted into two razor-sharp claws. Alex ran towards Finn, and pounced at him like a panther, claws outstretched to shred Finn to pieces. Finn raised his sword in the air, pointing it at Alex. Alex's momentum carried him forward, impaling himself on the end of Finn's blade.

Finn kept his hand on the sword, standing up. Alex's hands had changed back to normal, but he was still coming, pushing himself closer to Finn, driving the blade deeper into his body. Finn panicked, and kicked Alex back, letting go of his weapon.

Alex stumbled backwards, leaning against a wall. Then he stood straight, the light shining from the door giving a perfect view of the sword stuck trough his torso. The point of the blade was sticking a full foot out of his back. Finn looked at Alex, "No one can survive that" he thought. Yet Alex gripped the handle of the blade with both hands and slowly began to pull it from his body. Finn began to feel the first twinges of true panic grip him as he realized that he had no weapon.

Then a large yellow fist shot out from behind him and punched Alex, sending him flying out the door of the vault. Finn turned around to see Jake, bruised and his nose bent at an unnatural angle, but alive. Finn smiled at him and the two walked out into the open.

They looked out over the edge of the cliff outside the door of the vault. In the distance they could see a man, pushing himself up off the ground. Jake made himself huge, Finn jumped up his back and the two of them ran as fast as they could.

"Oh my glob Finn, what kind of monster was that guy? He just wouldn't die!" "Whatever he was, he's a menace to the kingdom. We've got to warn PB about this." Finn replied. The two then spend off towards the candy kingdom.

Alex's POV

Alex picked himself up off the ground, pulling the sword out of his stomach. He looked up at the side of the mountain. Those two adventurers, what were there names, Finn and Jake, was it? The two of them were running like the devil himself was following, the dog a huge version of himself, the boy on his back. Alex couldn't muster much hate for them. Honestly he didn't want to attack them, it's just... his every instinct was telling him that he had to find food.

Alex walked off into the nearby forest. As he walked, he thought about his fight with the two. Though he wasn't entirely proud of attacking them, he had to admit it was the most fun he'd had since the bombs first fell. Since Dana...

Dana.

Flashback

He was sitting next to her, they were watching the news. The news man gave a panicked report about how a nuclear missile had been launched at the city. Alex picked Dana up bridal style and ran out the door. He was running as fast as he could. Yet about halfway to the nearest bridge, a shockwave rocked the city, and Alex stumbled. He looked back and saw the fast approaching wave of flame. Alex's mind panicked. He saw an alleyway and ducked into it. He held Dana close and whispered "It'll be alright."

Then the wave of flame over took them. Alex closed his eyes, and when he opened them Dana, his sister was...

Alex dismissed the thought, and continued moving through the forest. He eventually came upon some poor random stranger wandering in the woods. They had blue skin, wore Viking armor, and were extremely muscular. Alex approached from behind, and attacked.

It was the most satisfying kill he'd ever made.

Finn's POV

Finn and Jake rushed through the doors of the candy palace, and ran up the stairs. They found the princess in her lab as always, doing sciencey, things.

"Princess Bubblegum! Princess Bubblegum!" They both began screaming. "What is it?" she asked, slightly annoyed. Amidst a flurry of unintelligible sound, the two managed to convey the gist of what had happened.

"Oh, no." she said. "Do you know where he's going next?"

They both gave her guilty looks. "Well," Finn began. "he might have seen us coming this way, and followed us"

"What!" she screamed. She then began pacing. "Okay, this is bad, we need to get some help." "Like who?" Finn asked. "Call up the banana guards, Marceline, and though I hate to say it, The Ice King. We'll need all the help we can get. And get yourself a new sword!"

Eight hours later

Finn looked at the ragtag team they had gathered. After him and Jake had received medical attention, Finn had picked out a new sword made from a carbon treated rock candy. It was inedible, but stronger than steel, with a blade sharp enough to shave with. It still didn't feel right, but it was the best he could get on short notice.

In their group was him and Jake, Marceline with her axe-bass guitar, and the Ice King, who'd been informed that he'd be put in the dungeon if he tried anything. Finn had called an extra number for help, but they hadn't shown up, and he doubted they would. Either way they were pretty much ready for war, war against a one man army.

Alex's POV

Alex had walked in the direction he'd seen Finn and Jake go. Whenever he asked himself why he was following them, he couldn't find an answer. After a while, he supposed it was to ask for forgiveness. That wasn't usually his kind of thing, but he was completely lost in this world, and they would probably make more valuable friends than enemies.

He kept walking, through the day and into the night. Finally he found himself standing before the gates of a large kingdom. There were two giant gumball machines, one on each side, blowing bubbles. The even stranger thing was that the entire place was made from candy. Alex found several guards patrolling the wall. He consumed one, quietly, and made his way towards the castle. Finally he stood before the doors. He slowly opened them, knowing that they would probably be hostile at first. He dropped the Banana disguise and walked in.

Alex took in the scene before him. There were four people in the throne room, waiting for him, the two adventurers Finn and Jake, an old man in a blue robe, who looked slightly familiar, and a girl who's clothes and skin were pink. Alex opened his mouth to speak, but then a huge weight cut into his back. He spun around to see... nothing. Then he was hit in the back again. Frustrated, Alex activated his armor ability, and changed his arm into his blade.

He glared at the four before the throne and said, "If that's how you want this to go, then COME ON!"

That's my second chapter. Let me know what you think. Please R&R.