Hi! So, this fic is for The AU Challenge by queen-sheep.

My prompt was to write a time travel AU, and being the Whovian that I am, got super excited.

Then I wrote this, which is nothing like Doctor Who. But I had a hell of a fun time cooking up this idea.

NOTE: This is meant to be a five-part story. Each of the parts will be really short. (I was originally going to make it a oneshot, but decided it would be more fun to post one part a day)

In this fic, demigods and Olympians still exist. But time travel turned it into an AU.

Disclaimer: I don't own Percy Jackson.

Part One

The first time he saw her, he had just successfully dug to the bottom of the sandbox. It was blue. He could even knock his knuckles against the bottom. A few grains of sand stuck to his skin, but he shook them off with a gleeful flick.

There was a small flash in the distance. Percy blinked, wiping his hands on the side of his shirt. The flash seemed to have happened from behind the building. He squinted, then carefully rose to his feet. A few wobbly steps across the slippery sand, and he was out of the sandbox and on the pavement.

Teacher came out then, wearing the blue polka-dot skirt Percy loved. She waved her hands around. "Come on in, children! It's naptime!"

Percy gave the building where he had seen the light one last, lingering gaze, before he jumped away and skipped for the door. Teacher smiled at him. He beamed back. The classroom was warm. The walls were covered in a calming aquamarine wallpaper.

He didn't notice the swish of long blonde hair right behind him, or the piercing eyes that widened as they landed on him.

There were cots against the far end of the room, and Teacher held Percy's chubby hand and led him to one. The cot sounded like his rattle. He giggled, and Teacher's eyes brightened at the sound.

Teacher gently lifted up the corner of the blanket and gestured for Percy to get him. He climbed onto the colorful bed and closed his eyes, letting the warmth of the room lull him to sleep.

Once all the preschoolers were settled in, the lights turned off, with bright blue night lights dotting the walls. Percy's breathing softened as he drifted further and further into Dreamland.

There was a sudden beeping sound, and the teacher glanced into her pocket with surprise. She tugged the pager out, blinked at it, and then made a faint groaning sound. She stood up, and then gently stepped out of the room, making sure her footsteps were soft and gentle.

After she disappeared behind the door frame, the room was perfectly still, filled only with the sounds of gentle breathing and humming.

Then, there was a faint hissing sound.

A girl, looking about 17 or so, stepped in and whipped her head around. She moved silently and stealthily, creeping up to each bed and peeking at the children. The first had a redheaded baby. The next one was a girl. And the next one was blonde.

Finally, she reached Percy's bed, and upon identifying him, she let out a relieved sigh.

The blanket shifted, but Percy hadn't moved a muscle.

The girl bent down, and gently slipped her hand under the blanket. Her hand shuffled around, careful not to touch him, feeling around for the source of movement. Suddenly, her hand tensed, and in a flash her hand snatched the snake and squeezed. Hard.

The snake writhed and twisted, but in a few minutes, it had gone limp.

The girl then tugged it out from under the blanket, and studied it. She had never been an expert on reptiles, but she was intelligent enough to recognize the bright coloring as a sign of a venomous serpent. Not a monster (or it would have dissolved), but still very dangerous, especially for a four-year old like Percy Jackson.

As if he had heard her thoughts, Percy rolled around, eyes fluttering open. His vision was blurry at first, and he had to keep blinking. He could just barely make out a girl, wearing lots of orange. Her blonde hair was tugged in a ponytail.

"H-hello?" He whispered.

The girl smiled gently. "Shh," she said, stretching her arm forward. Her fingers moved toward his face, as if to caress his cheek, but at the last moment, she hesitated. Changing her mind, she settled for tugging the blanket so it was properly wrapped around his shoulders.

The blanket was warm, and Percy smiled.

"Get some sleep," the girl said, voice no louder than a faint breath. "It's too soon for you to know me."

She reached her hand in her pocket and started to pull something out. Hat, thought Percy.

He blinked.

The girl had vanished.

The poor young toddler didn't know what to think of the mysterious girl, but he decided to take her advice. The bed was comfy, after all.

He closed his eyes and napped. There was another flash, but he didn't see it.

Again, short. Let me know what you think! (Even if it's a piece of crap)