A/N: This is my first crossover fic, but rate fairly. As we know, when the Doctor visits Amy and Rory in the Impossible Astronaut, he's gotten two-hundred years older. Amy, Rory, and River travel with him throughout the rest of the series for what, a year? At least, that's my understanding. So what would you do if you were a thousand-year-old timelord with nothing to do? Visit the Fire Nation; duh. ^_^

Katara rolled over on the silk mat, frowning at the ornate wall. A map covered with red hung there, glaring down and reminding her that they hadn't changed out the décor in this room for years.

It had only been two since that map had been accurate. Two years ago, she never even considered that she would be within the Fire Lord's palace, much less welcomed there as an honored guest.

Katara sat up as she heard footsteps, trotting to the door. She opened it, expecting-

"Oh. Hello, Mai."

"Expecting someone different?" Fire Lord Zuko's fiancé walked past Katara and into the quarters. "I can't believe they gave you this room," she remarked sullenly. "It hasn't been used for years."

"I chose this room," Katara murmured, struggling to keep her voice respectful. Despite the fact that Mai had proven her loyalty to Zuko and the avatar's cause, the waterbender had a hard time trusting her.

"Oh. Why?" Mai sniffed at the burning incense. "It smells like plants in here."

"The incense was a gift from Toph's mother," Katara muttered, fist clenching. "I chose this room because it wasn't too gaudy."

Mai glanced at the map on the wall. "You didn't take this down?"

"It's a reminder."

"Of what? Wasted years of fighting? Your family being torn apart, your mother taken away?"

Katara's blood suddenly felt like ice. "Who told you?" she hissed.

"Zuko, obviously." Mai wandered to a dresser, picking up an earthen figurine. "He tells me everything; he trusts me." She examined the penguin figurine, stating, "A gift from the avatar, huh?" Mai smirked and set it down. "Cute."

Katara clenched her fist; she hadn't seen Aang for months, nor Sokka or Toph. "Have you gotten any word from him?"

Mai glanced at her with dead eyes. "Go ask Zuko, but wait until after his peace meeting." She paused, and then added, "And after he's signed a few new decrees."

Katara sighed. "Forget it." As Mai exited, the waterbender sat down at her desk and watched the earth penguin dully.

"Oh, and Katara?" Mai remarked on her way out. "Don't even think about falling for him."

Katara stood up, furious. Before she could retort, though, Mai closed the doors with a smirk.

The waterbender sat down, muttering obscene things. She might as well have been placed under house arrest when forbidden to talk to Zuko.

For years, Katara had been trying to convince Mai that she wasn't a threat, but the Fire Lord's fiancé still didn't believe her.

Katara chose to think about other things. For one, she missed Aang, Sokka, and Toph. The avatar and her brother had gone to restore the air temples, while Toph had gone to visit her family in Ba Sing Se. Katara had volunteered to stay at the Fire Lord's palace in case of any traitors.

It had been one month; she had never felt more useless.

Katara stood finally, sighing and exiting. She would go to the turtle-duck pond and practice waterbending… again.

Breakline

So many worlds, so little time. The Doctor whirled around the console, wondering which one to visit next. "Well, hello!" He frowned at a planet; humans, though they had lost their technology and replaced it with a form of science called… bending.

The Doctor was more than intrigued; he wondered how he'd ever missed such a marvelous planet and pushed a few buttons, pulling a lever, and staring at the screen. "Ooh, a war? Hate wars. A hundred years! Well then! Let's try for a few years after; there's bound to be some interesting people."

Katara suddenly let the water whip fall back into the pond; she looked around, confused at the rippling sound. Or was it a tearing sound?

She turned, screeching and falling back as a large blue box appeared before her. The box towered over her as it became clearer, more substantial.

Suddenly, the door opened and a head poked out. "What a planet!" The man walked out, smiling at her. "Hello! I'm the doctor!"

Katara stared up at the man; he wore the strangest clothes she'd ever seen. His robe reached to his waist, and his hair was light brown. He had a strange knot at the base of his neck, and his pants were stiff and straight.

The Doctor offered his hand to the girl. "Did I knock you over? Sorry about that; I didn't mean to startle you. What's your name, then?"

Katara blinked at this ridiculous person. His hand was still extended to help her; as she stared into his strange, foreign eyes she saw the age and the sadness behind the silliness. Katara took his hand, standing.

"Katara."