I'll stay up all night, staring at the sky
You're somewhere on the other side
If you're sleeping alone tonight, let me be your lullaby- Lullaby by Paradise Fears

Author's Note: this is my first cross over fanfic so I hope y'all like =)

Traveling with the Doctor was like nothing you could ever imagine. Anywhere in time and space at the tip of your fingers, and all you had to do was say where you wanted to go. It didn't always take us where we wanted to go but we always ended up where we were needed. I always thought I'd be traveling with him forever. Forever ended when I was sent into a parallel world.

We were flying the TARDIS just like another day when it went crazy. Explosions everywhere and the Doctor and I were being flung about.

"WHAT'S HAPPENING?!" I yelled.

"I DON'T KNOW SHE'S PICKING UP SOME KIND OF SIGNAL." His words became faint as a white light flashed around me. It felt as if I was being punch in the gut and tossed to the ground. As the light subsided I found myself in the front seat of a car. As my eyes were adjusting to the lack of light I saw familiar markings on the dash. I let my fingers glide across them as I smiled. I was in the Impala my Impala. I looked to the driver's seat to see Dean looking at me very perplexed.

"Who are you?"

"Dean it's me, your baby sister."

"I don't have a sister."

"Dean what are you talking about it's me Samantha." I choked on my words and tears filled my eyes.

"You must have made a mistake I don't have a sister just a brother." I pulled my bottom lip in as I often did when I was nervous. How could he not remember me? It was my Dean right? The car was the same, the marks are the same, and even the smell was the same. I figured I'd been traveling with the Doctor for about 2 years but you don't forget these things that you've had all your life. I was trying to piece everything together but this Dean was badgering me with questions.

"How do you know my name? How did you get in the car? And where is Sammy?"

"Funny you used to call me that" I said softly.

"What?"

"Let me ask you a question was there some weird light that filled the car and then Sam was gone?"

"Yeah how did you know?"

"Because the same thing happened to me. I'm Sam Winchester and I'm stuck in a parallel universe."

"Come again?"

"I know this is going to sound crazy but we're from different universes. In mine you are my brother. You see parallel universes are practically the same with small details altered. So in this world you have a brother named Sam and in my world I am that Sam in a way."

"This is too weird."

"You're telling me and I major in weird."

"Are you a hunter?" He asked me.

"Time traveller. How is hunting weird?"

"Dad never got you and other me into hunting?"

"No he was more of the drinking type."

"Something's never change." He smirked. "Tell me everything about you as quick as you can."

"I'm Samantha Winchester I've got one brother named Dean, and a half brother named Adam. My dad's a lousy mechanic and I ran away with a mad man with a box. Your turn."

"I'm Dean Winchester and I have one brother named Sam and a half brother named Adam. My dad was a lousy father and we hunter those monsters in your closet."

"Scary similar don't ya think?"

"No your life seems better than mine believe me kid."

"You don't know anything about my life."

"Your mom alive?"

"No she died when I was little."

"Let me guess you were six month and she burned on your ceiling."

"That's insane. No she died when I was six years old, but she was burned not on the ceiling but in her restaurant. She was a chef and the kitchen caught fire."

"Ok million dollar question: where is my Sam?"

"I'd say he's with the Doctor. It appears as if we traded places."

"Well untrade places."

"Believe me I would in a heart beat but I'm not entirely sure how I even got here."

"Sammy where are you?" Dean mumbled to himself as he looked up to the stars.