You guys voted for it, so here goes!

Disclaimer: I dont own any of the adventure time characters except for the OCs in this story. Also, my inner knowledge about guns is going to come out. I am not a gun enthusiast, but i grew up around guns, so naturally, i was taught how to use them.

Also, the beginning of this story happens during the events of After Dark, not too long after Finn's birthday.


On a dark night, somewhere underneath the stalactites of a cave in the land of Ooo, lies a house where Marceline, the vampire queen resides. Tonight, she is accompanied by her lover, Finn, the human, for a jam session with his newly acquired axe guitar that Marceline had given him for his birthday. They have been dating for seven months and things were going smoothly for the couple. Finn awaits his lady in her bedroom as she takes a quick shower. He looks around the room, staring at the pictures on the pink wall. There were pictures of her travels all around Ooo, places that Finn has never seen before. One particular picture, on her pink wall, caught his attention however. It was a highly desaturated picture, in mostly black and white. Finn stood up from Marceline's bed to get a better look. The photo was of a group of humans holding what looked like unconventional blades, with multiple grips.

What kind of sword is that? He thought.

He examined the picture some more, but he was only able to make out two familiar faces: Simon and Marceline, who were both also holding the oddly shaped weapons. Marceline must not have been older than seventeen when this photo was taken. There was, however, a third familiar face; a face Finn could not put his finger on, yet it was at the tip of his tongue. He heard footsteps coming from the bathroom, and Marceline caught him as he quickly scrambled to put the picture back on the wall. "Sorry," he said.

"Oh that… It's no problem," she replied as she flew over to him, still in her bath robe. "I saw you observing that picture."

"Yeah… who are these people?" Finn asked quietly. "And what are they holding?"

Marceline removed the picture from the wall and held it to her face. "Well… these were my friends. Survivors of the Mushroom War." She pointed to the weapons they were holding. "Those are assault rifles."

"Assault rifles?"

"Yeah… think of it like a bow and arrow machine. Instead of firing arrows, it fires the small, sharp metal objects called bullets. They fly very fast and are very accurate. They can blow your limbs off and kill you quickly."

"Wow… sounds amazing."

Marceline shot Finn an odd look, but he couldn't understand why. "These were weapons of destruction, Finn. I'm actually glad that they are gone. They could do a lot of damage and they can give a single person a lot of power. A weapon not to be messed with."

"Ohhh…" They both sat there silently, staring at the photo. "What happened? Like how did you become a part of this group?"

"You really want to hear it? It's pretty long?"

"Marcy… we have all night." Finn leaned in and kissed her, making her blush in all shades red as he held her hand.

"Well… if you really want to hear the story… I guess…

"The first thing you need to understand is the Mushroom War, from how it started to how it ended so quickly. Unlike most wars, which usually lasts years on end, the Mushroom War only lasted about six months."

"Why so short?" asked the hero.

"I'm getting to that. Anyway, contrary to popular belief, the Great Mushroom War had actually started by mistake. There was a place called the United States of America, and another called North Korea, who were both at each other's throats over a thousand years ago. The USA were doing nuclear weapons testing, but had forgotten to inform the entire world. Once North Korea detected the launching of nuclear missiles, they launched every nuclear warhead they got against the US."

"Wow… these nuclear weapons must have been powerful," Finn stated in awe.

Marceline had her gaze towards her boyfriend. "Oh yes. They were. A single nuke can wipe out a huge portion of Ooo with a single blast. The rest of Ooo would be decimated due to radiation poisoning and nuclear fallout." She then returned her gaze back towards the photo. "You see, if you look at the world map, the giant chunk missing from the planet is actually where the United States once was. After that, all of NATO, the alliance that the USA was in, which is similar to our own UAO (United Alliance of Ooo), gathered their forces to battle North Korea. The battle only lasted six months due to the intense radiation poisoning caused by the nukes. The radiation killed off all of the planet's population… or so we thought…" She took a deep sigh before continuing. "It actually turned out that there were some who were immune to the radiation…"

"There were survivors."

"Exactly… Anyway, in order to understand the story, you need to know this." Finn listened cautiously. "I wasn't born a vampire. I aged like a normal human. Once you were turned, you don't age anymore. So as you can tell, I was turned in my late teens. So now… where was I?"


983 years ago


Around the ruins of what used to be Moscow, Russia, a couple was roaming the empty streets. One would originally think that they were father and daughter, but no… they weren't. Simon Petrikov was walking the streets of Moscow with the seventeen year old Marceline Abadeer. Over the past week or so, Marceline had grown weak, due to an illness that neither of them knew of. She had not been turned into a vampire yet, so she suffered the same illnesses of humans, despite being half a demon herself, and Simon, despite having a bad back at his age, had to carry Marceline because she was too weak to walk. They were on another run to get supplies. Simon had originally wanted Marceline to stay put while he ran into town, but she didn't want him to leave for she was quite delusional.

The skies had been turned gray and over the past 13 years, it had never stopped snowing. It was a direct result of the massive atomic explosion that cause the war, which was why it was called 'nuclear winter.' Simon had no problem adapting to the cold because the crown turned his body icy; unfortunately, Marceline was still a warm-blooded creature. Simon looked up at the skies and thanked god that there was no snow storm approaching… well… at least yet.

When they finally came across a pharmacy, Simon set Marceline down in a dark corner and began to rummage through the mess of pills and vitamins. "Shit, nothing for a fever… these guys have been picked bone dry," he mumbled as he frantically dug through the drugs. "Maybe they have some chicken soup or something…" he ran to check up on the food section of the drug store, but nothing. There were at least some bags of chips on the floor, and even though they aren't as healthy or as warm as chicken soup, it was all they had, so it had to work for now.

As he began to bag the chips, he heard two loud metallic clicks and froze in place. "Drop everything you have and walk away…" the deep, British accented voice demanded. Simon looked up at the two shadowy figures, whom had their assault rifles pointed at him.

"Please, don't shoot. I beg of you." Simon pleaded. "I need these supplies."

"I said DROP THEM!"

Shit there isn't any way out of this… if I die, so does Marcy. But if I kill them, she has a chance. Simon looked down to the crown he had tied to his belt. His hands were shaking in anxiety. I'm sorry Marcy… please forgive me.

As Marceline saw Simon reach for the crown, she gathered up her remaining bit of strength and pushed herself up. "Simon don't!" she yelled. The guns were now pointed at her as she took two steps forward before collapsing on the ground again. The taller, deeper British voiced man took one long look at Marceline, and while he was originally going to execute Simon, he saw something in Marceline that made him decide otherwise.

"Marcy! No!" Simon rushed to her side as the man followed him in his iron sights. Marcy was coughing immensely on the floor as Simon picked her up and held her in his arms.

"Is that your daughter?" the British man asked.

"Please… you can kill me if you want, but don't kill her… please. I'm begging you." Tears began to drip slowly down Simon's face as he begged for mercy.

The man takes one last look at Marceline and lowers his rifle. "Bloody hell..." he looks to his partner, who still has his rifle aimed towards the defenseless persons, shaking. "Rook, stand down…"

Time slowed as Simon stared down the end of the barrel, thinking that this was it. I'm gonna die… He shut his eyes tightly, bracing himself for what was going to happen next…

Bam!

Well… that was quick and painless, he thought, but he opened his eyes, noticing that the other man had pushed the weapon, aiming away from them. Oh thank goodness…

The dark silhouetted British man yanked the gun out of Rook's hands. "Now you listen to me… don't you ever disobey me again, or else next time, I'm leaving you for dead." Rook nodded his head, afraid of his words. The tall British man walked into the light, revealing himself. He didn't seem like an old man… not as old as Simon at least, but he was definitely one of the older looking gents, not any older than forty. He had a few scars on his face, but nothing too serious. The man knelt down next to Simon and Marcy. "Alright, chaps… I ain't gonna hurt you…"

"What?..."

"Listen, we got a camp about a good ten miles from here. If we take turns holding her, we could get there in a few hours and fix her right up. But you are going to have to trust me…"

"Trust you?" Simon chuckled. "I just barely met you. The both of you had a gun pointed to my head not fifteen seconds ago. Why should I trust you?"

"Because you don't have any other choice. You can either believe me or not, but if you don't, she dies. At least one way, you have a chance to save her."

Simon grumbled as he thought of his choice, or rather lack of choices. Unfortunately, his thoughts were cut short by an eerily disturbing sound of something making their way towards them from outside the pharmacy. The British man ran outside to assess the situation and to his horror, he ran back inside. "Toxics! At least five hundred!"

"What? How did they track us?"

"Fuckin Rookie's gunshot must have alerted them." He cocked his rifle. "We need to get to the rooftop! Follow me!" Simon picked Marcy up within his arms as Rook followed behind them. They quickly reach the rear end of the store, where the stranger kicked the door down, revealing the staircase. "Come on! We're going up!"

As they ran up the staircase, Marceline was going in and out of consciousness, remembering the little amount of happiness she had had in her life so far. Her earliest memory was of her mother, when she was born in a quarantine zone, not two months after the war began. They were surrounded by death, whether it was outside or inside. Inside, people were being accused of being 'infected' while people outside were fighting for their lives against others and the horde of toxics. The 'infected' were immediately put down in front of the streets; which was also a message letting the people know who exactly was in control. No one was allowed in or out of the city. The infant Marceline held her mother close, who was the spitting image of Marceline when she was older. The quarantine zone, which was once a peaceful paradise, quickly turned sour as people began to riot against the law, breaking into houses, killing fathers, and raping their wives. The last thing she saw, right before she went back into being conscious again, was her mother being executed, not for infection, but for treason; she risked her life to get Marceline out of the city.

The only remaining happy times were with Simon. The stories that she had heard from him made her happy, hoping that one day, it could go back to that. She had never seen the world Simon saw, for she was born not two months into the war. Nearly everything around them at the time was decimated and the only thing that kept her comfort was hearing Simon's stories. They allowed her to visualize the way that the fallen and crumbling buildings around her once looked.

As she fell back into consciousness, she was blinded by a bright light. The stranger had kicked down the door, revealing the rooftops. Rook got on his radio as Simon and the stranger barricaded the door. "This is Rook! We need immediate evac! We are at the pharmacy!..."

The stranger approached Simon, holding a sidearm in his hand. "You know how to use one of these?"

"I only shot one once!" Simon replied.

"Good enough! You're gonna have to set her down!" Simon was unsure at the man's suggestion. "Don't worry. We are going to protect her, but you're going to have to trust me!"

Simon nodded and laid Marceline down on her back, trying his best not to place her whole body in the snow. "Marcy… no matter what happens, I love you." He kissed the currently unconscious girl on her forehead and turned back around, facing the now barricaded door that they just came from. He readied his weapon, awaiting the onslaught before him.

The stranger turned to Rook, who was shaking in fear as he stared at the door, listening to the pounds of the monsters about to breach. "Rook! Here!" he tossed Rook's rifle back to him. "Don't fuck up this time." Rook nodded his head and readied his weapon. "Alright, how long do we have?"

"Three minutes!" Rook replied, not taking his eyes of the door that was dismantling.

"Good enough." The stranger aimed his rifle at the door, head level. "Ready!..."

Time slowed as the three focused on the door. The only sound they could hear were the monsters bashing the door down, trying to get to their meals. The sound if it all was deafening as well as haunting. As Simon watched the door dismantle, time came to a standstill, and with no warning, it suddenly sped up. The door finally broke down and out came a massive horde of the slimy monsters. One by one, the horde fell as the guns went off, blasting away at their heads. With every monster that dropped, another three quickly came to replace them. The ice on the rooftop floor melted into water once they came in contact with the hot shell casings that ejected from the firearms.

Simon fired away, desperately trying to keep the beasts off of him and Marceline. He fired and fired, and with each shot, he dropped one until…

Click, Click, Click…

"Shit! I need more bullets!"

"Last mag! Make it count!" Rook tossed his remaining sidearm magazine and as Simon attempted to catch it, the sweat developing on his hands allowed the magazine to slip right through his grasp. It was lost in the snow beneath him.

"Shit!" He scrambled on his feet, desperately digging in the snow for his shot at life. "C'mon where are you!?"

"Hurry up Simon!" the British man screamed.

Simon waved his hands through the snow until he felt something cold and dense come in contact with his fingers. "Gotcha!" He pulled out the magazine, shook the remaining ice off and shoved it into his pistol, chambering the first round as he went.

The three minutes they fought for their lives seemed to have been forever, and at long last, the evacuation team had finally arrived. The helicopter swooped down on the far end of the rooftop. "Simon! Rook! Get her on board! I'll hold them off!" Simon nodded at the stranger's commands and carried Marceline in his arms. He dashed toward the helicopter, just barely able to dodge the attacks of the slimy monsters. Rook had already made it to the helicopter and grabbed Marceline from Simon, exchanging her for Rook's rifle.

Simon turned back towards the stranger. "Come on! I got you!" and as the stranger turned around to make a run for the helicopter, Simon readied Rook's black rifle at the monstrosities attempting to grab at the man, and opened fired.

Bang Bang Bang Bang Bang….

One by one, they fell as the British man made it to the flying vehicle. When he was finally on board, he tapped Simon's shoulder, signaling him to come up. He climbed aboard and off they went, speeding into the distance.


After having a moment to catch their breath, Simon finally decides to break the ice. "Hey thanks for saving our asses back there."

"No worries mate."

"Oh I'm sorry. I forgot to introduce ourselves. I am Simon Petrikov and this is Marceline Abadeer." He stuck his hand out.

"The name's William Michael Fletcher. Folks back at camp just call me Billy." He returned his handshake.

"Billy, huh?"

"Yes. That's right. This is Rook, obviously short for Rookie."

"Nice to meet you there, Rook." Simon stuck out his hand and Rook returned his handshake. "Say, are you guys British?"

"Oh jeez, is it the accent?" Billy joked.

"Long way from home, don't you think? I mean, we are in Moscow."

Billy laughed just an instant longer before becoming suddenly serious. "There is no home anymore Simon."


I hope you liked it. this is actually the first time i am writing about gunplay... Dont forget to leave a review and i will try to answer questions if they dont spoil the plot.