Author's note: Yay for Adventure Time! I'm totally obsessing right now, so I'm writing a little fanfiction. None of the characters belong to me. This is sort of just an introduction to the character of Marshall Lee and my ideas on the Mushroom Wars and beginning of the lands of Aaa, Ooo, and the Nighto'sphere. If you want to, you could probably just skip this. Or read it. Whatever.

The sun shone down brightly in the land of Aaa. It was always bright and sunny here, the perfectly green grass swaying in the breeze, tickling Fionna's legs. Sitting next to her with an umbrella in hand was her friend, Marshall Lee, the Vampire King. Marshall was very old for his young appearence and attitude. That was due to the fact he was immortal of course. Marshall looked out over the rolling hills, the triangular peaks of the Ice Kingdom's mountains in the distance.

"Hey Marshall?" Fionna looked up and into his pitch black eyes. He raised an eyebrow at her.

"Yeah?"

"I was wondering, how old are you?" Marshall blinked for a minute. He smirked at her.

"1000 years. Why?" Fionna did the math on her fingers the best she could. She was always terrible at it.

"So...You lived during the Mushroom Wars?" The usually playful and relaxed Marshall went serious, a solemn look on his face, the memories of that horrific time coming back to him.

"Yeah, I did. The end of them, anyway." He didn't look at Fionna, her blue eyes batting at him. It was silent for a moment.

"Do...Do you remember anything?" He didn't answer and for a moment, and Fionna thought she had offended him.

"Yes. Do you want to hear about it?" he sighed. He smirked at her, as though her sudden curiosity in such a violent subject was appealing to him. She nodded her head vigurously and he smiled even more, showing his fangs. "Very well then." He leaned in close to her, only a few inches from her face. He sneered as if telling a scary story around a camp fire.

"Before we called this world Aaa, the planet was called Earth. Greatly detailed beings called humans roamed it, in control of all other species. There were no candy people or vampires or rainicorns. Humans and a few animals. Most of the world at this point had been stripped of all natural resources. Countries went to war, fighting over any land that still had what they needed. The nuclear warfare between them began to change the way we looked. Details began to disappear and we shifted into a 2D form. Have you ever heard of 3D? Probably not. It's a very hard concept to grasp." Fionna stared at Marshall Lee, wide-eyed and interested. "Anyway, in this change, several new creatures were created. Mostly mutants of people. This included the undead and vampires."

"What about candy people?" Fionna asked.

"Oh no, not yet. Not that farly mutated. Don't worry, they come in later. My grandfather was one of these mutants. These undead are not like the usual ones you hear about. They weren't zombies. They just happend to be immortal and didn't have a beating heart. His name was Marcus. He roamed the land in vain, looking for someone like himself. He found a woman named Resputia. They married and had a son. This son...is my father." He spat the last word, glaring past Fionna at the idea of him. All of his joking manner on the subject disappeared. "Since the Earth was in such a state of chaos, my grandparents feared raising their son here. Using their immortal abilities, they opened up a whole new universe, connected to the planet. They found that the warring states stopped in the night and peace would come over the land. So they made their new world dwell in the night and named it the Nighto'sphere." Marshall paused and looked at Fionna. Her mouth was gaping open. "What?"

"You mean you grandparents created the Nighto'sphere? That's totally rad!" Marshall laughed and rolled his eyes.

"Yes, they did. My father grew up there. My grandparents thought he was safe, but because his mind was young, it still absorbed that of which was around it. The chemicals and evil happening in Aaa leaked into the Nighto'sphere and encased my father. These same chemicals seemed to react with something in the Nighto'sphere. Legend has it, another universe, much like ours, was created. Many people were paralelled. Granted, the world is a few years behind our own. They called it Ooo. When my father was 25 years of age, he supposedly found the entrance to Ooo. He then killed his father, gaining his immortality and domain over the Nighto'sphere. My grandmother was left helpless and became his servant. Realizing she'd have to serve him for eternity, she escaped the Nighto'sphere and went into hiding. My father tracked her down and executed her." Fionna's face was solemn now, and she looked down, realizing just how evil Marshall Lee's father was. He continued. "It was during this hunt on Earth that he met my mother. She was only a mortal, but my father fell in love with her anyway. They were married and soon, had a child."

"You?" asked Fionna. But Marshall shook his head.

"No. They had a daughter. Her name was Marceline. She was a mortal like our mother, but when she turned 18, my father had her turned into an immortal. There are several types of immortal you can become. Like me, she chose vampire. She drank blood like my father, but found it distasteful. She couldn't stand to kill anyone. The Mushroom wars had quieted down now, most of the humans extinct," he glanced at Fionna and winked. She blushed and he smirked before continuing,"and the waste and hatred no longer leaked through. She had a slight evil seed from our father's influences, but not enough. She found she could sustain herself on shades of red. But to go against evil's way was disrespectful and she was looked down upon. My father said he'd have to banish her if she did not perform an evil act. To prove herself, she killed the Vampire Queen. She gained the title of Vampire Queen and went to go live in the land of Ooo. My father tried to make her stay, but our mother helped her escape. My father found out and banished her to Aaa. My mother left and remarried. My father became lonely and went after her, only to find he was too late. Broken-hearted, he killed her and her lover and stole thier souls. This is why he hates mortals and how he gained the ability to eat souls. I had been born by then, of course." He paused and looked out over the horizon. The sun was beginning to set and Marshall Lee could almost set down his umbrella and be safe. Almost.

"I was two years younger than my sister. We were both very close to our mother since our father was constantly away on business trips. When my sister left the Nighto'sphere, my father cast a spell on me so that I'd forget she ever existed. I only had one memory of her left and asked everyone in the Nighto'sphere about her. They were not to tell me, but I eventually found someone who told me everything. The memories flooded back. That man was later executed. I still feel reponsible for his death. I became a vampire when I was 18 and was automatically crowned the Vampire King, seeing as there wasn't one yet. I taught myself to survive on shades of red, a new hatred for my father growing inside of me. I knew when he found out and ran to Aaa, away from the Nighto'sphere."

It was dark now and Marshall Lee put his umbrella away. Fionna looked like she was about to cry, but the adventuress was tougher than that and she sucked it in.

"So...This whole para-whatever universe thing, what do mean by it? There's another one of me?" Marshall nodded.

"Yes, but a guy." Fionna furrowed her eyebrows, obviously in deep thought. "Oh, and younger," he added. She was really confused now and looked helpless as she tried to think about it. Marshall laughed. "Ooo is a few years behind us, dim-bat. You're 15, right? That means he's probably 12 or so." She seemed to relax ever so slightly, but was still deep in thought.

"So, does that mean there's a girl of you?"

"No, because I was born in the Nighto'sphere. I visited Aaa a lot though. It was a wasteland for the longest time. The candy people had actually been mutated children. The children of drafted parents buried candy in the ground to hide it from others. When the abndoned children fell asleep over their sugary treasure, radiation caused them to sink into the ground and mold with the candy, turning them into candy people." Fionna seemed very interesed in the subject of the candy people, but Marshall didn't care for them. He shriveled up his nose and snorted.

"The only other creatures to live from that far back are the rainicorns. They live for very long amounts of time, but they're not immortal. Just old." They laughed and sighed, looking up at the stars.

"I wonder how you get to Ooo...," Fionna wondered out loud.

"Only my father knows. What an adventure that'd be, though."

"Yeah." Fionna yawned and leaned against Marshall before finally falling asleep. Marshall Lee sighed and grabbed her in his arms, holding her close to him. He flew her to the treehouse, going through the upstairs window and lying her on her bed. He looked at her peaceful face for a moment before flying back out the window and to his cave.