Author's Note: Guess what? Instead of working on my other pieces, I decided to start an entirely brand new project! As you might expect, I happen to be one of those people who became somewhat unsatisfied, to say the least, after the Adventure Time episodes Frost & Fire and Earth & Water. Thus was born some inspiration for this piece. Like my other pieces, I intend to write as much as I can whenever I can, so wish me luck!

Disclaimer: Any and all rights related to Doctor Who belong to the BBC and its affiliates. Any and all rights related to Adventure Time belong to Cartoon Network and its affiliates.

The area that once consisted of the Grasslands was now a barren field. The tree that had stood for centuries was nothing more than a mere memory. The same scene was over two domains that had once been completely different: the Ice Kingdom without its frosty essence and the Fire Kingdom without a trace of heat. All across Ooo, lands that were once fertile and full of life were all decrepit, save for one last plot of land in the area that was once the Candy Kingdom. On it was an owl with an essence of the stars, trying to fend of his mortal enemy. Although he was battered and bruised, he valiantly fought on, hoping that he would somehow triumph over the creature. The Cosmic Owl was the last thing standing on the planet that had been so nearly annihilated countless years before by the very same being standing right in front of him. And he was losing the fight, not far away from the brink of death.

That figure was the oldest form of evil that remained in this world. It had been spawned from the Great Mushroom War, the conflict that had transformed the planet forever due to the release of massive radiation. It was a dark creature with a horned skull on one side and, eerily enough, what could only be described as the remains of a balding man on the other. Its aura was so powerful that it had been able to conquer the world just by existing, its essence overpowering the mortals that had fallen. It was the bane of all life, and there was only one creature left standing to face him. And the Cosmic Owl was losing.

The Lich advanced ever closer to the one so many had turned to for help and guidance before their inevitable demise. "You are all alone," he said. "I have conquered all, and I am about to end all life forevermore. What hope do you have?"

He struck the Cosmic Owl, and both of them knew that he would not be able to get up. As he readied the final blow, the Cosmic Owl emitted one last noise. It was definitely not of this world, perhaps not even of this universe. Light flashed through the clouds, and the Cosmic Owl vanished. The Lich growled as, in his place, a blue box was appearing out of thin air. When it had finished appearing, a door opened, revealing a strange figure. "You…" he spat out as the door opened.

There was a man in the doorway staring down evil incarnate. He was shrouded in darkness, his features indiscernible. However, his voice carried a resolute power that made even the Lich take a step back. "Hello, Lich," he said. "I'm the Doctor."

"YO, FINN!" a voice yelled out. "WAKE UP!"

The teenager in questioned found himself being shaken by his bro. He eventually did get up and looked drowsily at him. "Jake?" he groggily mustered. "What time is it?"

"Oh, it's about 6 in the morning on this lovely day!" he enthusiastically replied.

"Wait, what? Why did you wake me up so early?" He paused before realizing something. "Wait, how are you even up so early?"

"Well, I was going to sleep in, but today's not the day to do that."

"Why? What's so special about today?"

"Dude, don't tell me you forgot your own birthday!"

Finn's eyes widened. "Oh, Glob! Wow…I can't believe it's already been a whole year already…"

"I know, bro! 16 already! You're almost all grown up! Boy, Mom and Dad would be going banaynays over this…"

As Jake kept on rambling about how fast time had gone by, Finn drew back into himself as he thought about how fast life was going. He and Jake had gone through a lot already in their young lives. From slaying tons of evil creatures to helping out others in all sorts of ways, he knew that his time with his brother were to be treasured forever. Recently, the time that they spent together simply going out on quests and adventures had declined, partly due to the fact that he had been spending more and more time with Lady Ranicorn. Not that he really minded that. After all, he was already a father himself, though his children seemed to have somehow matured to a far greater degree than he had. He was happy that Jake had managed to maintain a stable, happy relationship with his longtime girlfriend. Perhaps he would soon have the guts to finally marry her, something he knew that they would eventually do.

The same tranquility and consistency that existed in Jake's love life definitely did not exist in his own love life. This time last year, he and Flame Princess were still boyfriend and girlfriend. It had been his first true relationship with a girl. It definitely hadn't gotten off to the best of starts. Jake had taken the initiative to set him up, but, when he realized Flame Princess was evil and tried to undo the damage, he had unintentionally caused her to feel great anger towards him. He himself tried to talk to her and reason, but, every time he did, he would end up hurting her somehow, nearly causing her to burn the Goblin Kingdom out of spite. It was then when he had said that he would defy nature for her that they began to form a relationship, despite the fact that almost everything wanted to get in between them. From her father, the evil Flame King, to the fact that they would unintentionally harm each other with simple contact, it had seemed that every force in the universe wanted to get in between them. And yet, they had still persisted in a relationship. She made him feel happy and complete, and he felt that he did the same to her. He still remembered those days as some of the happiest in his life.

Sadly, it still eventually failed. It had been his fault. It had started after Ice King had decided to make fun of her. She ended up burning his hams and sending him back to the Ice Kingdom. That night, he had experienced a dream that felt gratifying to him, and he wanted to feel that experience again. A mild lie created another fight between the two, though Ice King had managed to triumph. When he went to bed, he had a stranger dream and realized that the Cosmic Owl was whispering something. He had wanted to get that message from the Cosmic Owl so desperately that he had forged inflammatory letters to her and Ice King, prompting them to fight once more and nearly resulting in the complete destruction of the Ice Kingdom. When he confessed his indiscretions, he saw how upset she was that he had betrayed her by using things only he knew about her to manipulate her. As a result, she had decided to break up with him, return to the Fire Kingdom, and usurp her father. The Flame Kingdom prospered under her firm but fair rule, and he had occasionally visited it. However, his visits became more and more infrequent as time passed. He had realized that each visit meant dwelling on the past, most painfully the what-ifs had he not been so reckless with her feelings…

"Finn!" Jake said as he slapped him. "Snap out of it!"

"Huh? What? Jake? Why'd you slap me?"

"Dude, you were staring into space for, like, ten minutes. I've been trying to snap you out of it. What gives?"

"Sorry, I was just…er…"

Jake's eyes narrowed. "Dude, don't tell me you're still hung up over Flame Princess. We've all worked really hard to get you off her!"

"What? No! I wasn't thinking about her! I've been over her ever since that time we went on that train!"

"First off, we both know that's bonk. When you and Lady Ranicorn rescued me from Kee-Oth, you were still in love with her. So what, may I ask, were you thinking so heavily about?" Despite every time Finn had tried to deny any lingering feelings for the princess, Jake knew that she was still on his mind. He himself still believed that the love they had shared might one day reassert itself, even though the prospect of such a thing grew dimmer with each passing day. Still, he thought they had spent too much time together to have had their relationship blown up by one act on indiscretion that he himself had had a part in.

Finn had to think fast to save his butt. His memory obliged, showing him the dream he had had before Jake had woken him up. "I was just…thinking about a dream. I think it might have been a prophetic dream."

Jake looked at him slightly less skeptically, though he was still suspicious. "Oh, really?" He knew that Finn hadn't had one of those dreams since Flame Princess had dumped him, and he knew that he wasn't especially eager to have one of them because of that result.

"Yeah…the Cosmic Owl was fighting the Lich…"

"WHAT?!"

Finn grimly nodded, realizing that their most dangerous enemy was on the rise once more. "I know…but there was someone else there too. The Lich was about to kill the Cosmic Owl when something just appeared out of nowhere. There was someone inside the thing, and it looked like the Lich wasn't happy to see him at all."

"Huh? Who could that be?"

"He called himself 'the Doctor.'"

"Doctor who?"

"I have no idea. But I'm concerned about the Lich. I've been wondering when that butt would show his face again…we've gotta be ready for him when he does…"

Jake nodded. "Course man, but let's try to at least enjoy your birthday. I got peeps from all over ready to get their party on." He opened the curtains, revealing a massive gathering of the denizens of all the kingdoms of the land together for one reason. "AM I RIGHT, Y'ALL?!"

A resounding cheer was all the answer Finn needed to lighten up a bit and jump out the window to greet them, never mind that he was still in his pajamas. Jake smiled and watched to make sure that he was going to have a good time before diving into a small opening underneath his bed. In it was a letter from one of the most powerful beings in the multiverse: Prismo, the guardian of the Time Room. Concerned with the prospect of facing the Lich again, he knew it was time to pay him a long overdue visit, those parties notwithstanding.

He put his finger on the P and instantly teleported away. He found himself in the large, box-like place that housed a great amount of power.

He soon spotted the one he was looking for, a being who had chosen to take the form of a two dimensional drawing. "Yo, Prismo!"

"Hey, Jake!" came the reply. "It's been too long, you know? Just us with no other people"

"Hehe…yeah, sorry about that. I've always meant to come back and hang one-on-one, but things just kept getting in the way, you know?"

"Yes, but certainly there's a reason you're here now? I don't think you would deliberately miss Finn's birthday party to see me without one."

Jake sighed. "Well, yeah…unfortunately, it involves the Lich again. Finn had a prophetic dream last night that had some sort of battle between him and the Cosmic Owl."

Prismo visibly darkened, obviously displeased by what he had to say. "Ah…the time approaches…"

"Huh? What do you mean by that, Prismo?" He took a quick glance at a corner of the room and made a startling discovery. "Hey! Where'd the Lich go?"

"I'm sorry, Jake. The Lich had been biding his time and power, able to manipulate another being into coming here and wishing him free. I've kept myself informed about the Lich's movements, and his power has grown ever closer to his original abilities. If nothing is done, the Lich will at last succeed in destroying all life not just in your universe but in every corner of the multiverse."

Now he was very alarmed. "Can't I just wish that he wouldn't, like last time?"

"Unfortunately, he has surpassed my power to affect him at all, even in his past. In fact, I think that my power has dwindled significantly because of his increased presence. Even if I could, you know I'm only allowed to give one wish per person, and you used yours fixing Finn's messed-up wish when he tried to wish the Lich had never existed."

"Gah, isn't there any way you could help a brother out?"

Prismo considered his point before responding. "Yes. Every being that comes here gets a wish, including me. I can make a wish to give you one more to help you, if your wish is still in my power to grant. Remember, you have to be very specific about how you want help and what for. I imagine that you've also been trying to look out for Finn's love life."

Oh, how he hated his penchant for getting distracted so easily. Concern for Finn mixed with the task at hand. Although he still had been worried about the Lich, his emotions got the better of him at that moment. "I wish someone would come to help against the Lich and help Finn and Flame Princess get back together." His eyes widened as he realized how vague his wish was. "Wait, that was so vague! Oh, Glob! I don't want some sort of bear taken from his family!"

"Too late, bro. But I will try to make sure the right person comes." He winked as Jake disappeared, the consequences of his wish coming to fruition. "In fact, I think I know someone who can do that and more. All Ooo really needs is a doctor."

A TV remote materialized, and a giant video feed appeared on one of the walls. It depicted a part of the Fire Kingdom not far off from the palace. It seemed to be a normal day, but rumbling soon changed that. From the sky, a rift appeared, and a blue box plummeted, having traveled across from a different dimension. It crashed into the ground, but no one seemed to even notice it. The rift resealed as the doors of the box opened. From it, a young-looking but very old man climbed out. He was equipped with an orange spacesuit that had served him well in hostile environments like the Fire Kingdom. Although he seemed to be shaken, he was still eager to explore his surroundings, just as Prismo had hoped for. "Specifically, THE Doctor."

So, what do you think so far? I haven't even decided which Doctor (9, 10, or 11) will be the focus, so please vote on the poll on my profile. Or leave your preference in a review. Once the Doctor is chosen, I hope to get the next chapter out shortly after.

UPDATE 3/1/14: Grammar and continuity fixes.

UPDATE 6/27/14: More continuity fixes.