Hey, so I am super sorry for the delay on this update. I'm such a dumb. But hopefully I can write more for this story, and make time away from school to update regularly. I really love both of these universes. I agree that the chapters are a bit short, but that's intentional, because I like to start small in stories. I'll try to make them longer in the future, definitely. (And to the reviewer who is asking for Tron crossovers, I know nothing about Tron, unfortunately. To the rest: Keep reading. And tell me what you think. Thank you.

"No!" The Doctor pulled a lever and glanced at the screen again. "That isn't right. At all. Not right. Not right." He wrapped the arm of his jacket around an overheated plug and pulled. "Nononono!" He jerked his hand back in response to the brief shock.

"Come on, come on, be a good girl."

The TARDIS, that's Time and Relative Dimension in Space, was the Doctor's primary mode of transportation, and it was presently falling uncontrollably into the atmosphere of a blue and green planet.

Little fires broke out in several parts of the ship, and the increasing turbulence forced the Doctor to hold on for dear life as the TARDIS shuddered into orbital fall.

"Nothing for it," he said, then took his glasses off and closed his eyes.

"What do you see, BMO?"

Beep.

"Uh huh. Is it a meteorite?"

Beep beep beeeep.

A noise echoed through the treehouse. It sounded like how colliding continents would sound, shrill and muffled by oceans.

"What the fluff was that?"

Finn stood up, grabbed his backpack and hat and slid down the pole.

"Lock up, BMO," he shouted, as he pushed through the door.

Brreeeeeep.

The doctor opened his eyes. He was lying on his back. He groaned quietly into his elbow. The smell of burnt circuits passed through his nostrils and made him stand up, alert.

"Agh!" he managed.

He got on his knees and lifted open a metal grate. "Repairs are required beyond the automatic regenerative capabilities," he mumbled, passing his hand through crystals, wires, and blackened boards. "This'll take a while. Now where'd you land me, darling?"

The Doctor, who is a Time Lord from the planet Gallifrey living out the Tenth iteration of his long life, arched his back and gave out a cat-like yawn. He strode to the door of the TARDIS and pulled it open.

The sun was just coming up over a soft countryside of grassy hills. One sun, speculated the Doctor. Earth?

Odd clouds assembled in the glowing light. The Doctor watched them carefully as they dispersed and took on new forms. Sentient vapor? Hard to tell. He wandered in a circle around the crater the TARDIS made, glancing up at the clouds every now and then.

"There's a whole kingdom up there."

Ten blinked. Sentient vapor with the ability to form sentences in English? This was definitely some trans-dimensional version of Earth. Strange.

"I'm right here, dude." Ten turned around and saw a youthful lad standing behind him. He had long, blond hair that reached to his feet and wore a tattered white hat with what looked like woolen ears sticking out of the top.

"Hello," said Ten. The boy couldn't have been older than nineteen. He was leaning on some type of void-colored sword that shivered with spatial and temporal energy. It made Ten blink to look at it for long. "I'm the Doctor. That's a neat trick," said Ten, but he was busy calculating the ways in which such an object could possibly exist.

"This? It's part black hole," said the boy. "I lost it for awhile, but a friend of mine restored it to me when we started getting interstellar visitors on Ooo. And she was right when she said I needed it. My name is Finn."

"Ooo?" asked Ten, and laughed because it sounded silly as a question. "That's the planet's name, is it?

"The continent's. Ooo, Planet Earth, the solar system, the Milky Way, the universe. All that cosmic biz. So you came from space too?" Finn squinted. "You aren't…?"

"Human? No, I'm not."

Finn sighed. "Yeah, of course you're not. My computer tracked your descent. Is your craft all right?"

Ten gestured to the blue, old-fashioned police telephone box half-buried in a crater behind him. "That's my TARDIS. Best craft anywhere and anywhen. It needs some work." Ten squinted. "You talk as if alien activity is a recent thing here."

"Well, it isn't completely new stuff to us. We've dealt with the governments on Mars many times before. But just last year we started getting visitors far away from here, like a bazillion miles away, from every direction. I've jumped dimensions and hurdled some wicked rifts in space and time, but this is some serious and scary stuff we're dealing with."

Ten laughed. "How can you possibly be scared of aliens to your planet in a world which treats dimensional travel and paradoxical swords as commonplace?"

Finn's smile faded. "You look like you want to help, so I'm trusting you. For now. Come on. It's better if I just show you."