Who?

The Alien Figure

The figure came toward them dressed in a brown suit with a beige trench coat. His brown hair was spiked upwards and looked as though it wasn't brushed in weeks.
"What the hell are you?" Dean yelled grabbing and pointing his gun at the mysterious figure, ready to shoot at a moment's notice.
"I'm the Doctor." The figure stated.
"Doctor? Doctor Who?" Sam asked.
"Just the Doctor. And who are you if I may ask."
"I'm Dean and this is Sam and what are you. A ghost, vampire, a demon?" He asked, spitting out the last word.
"I'm a Timelord." The Doctor said.
"Wait... what?" Sam questioned.
"I'm a Timelord from the planet Gallifrey."
"You're an alien? Yeah right." Dean said jokingly. But the serious look on the Doctor's face showed that this wasn't a joke. Soon after a blonde girl with a blue jacket came out of the blue box with a weird looking silver stick capped with a blue head.
"Doctor! You forgot your sonic..." She trailed off staring at the boys in front of her.
"Who are you blondie?" Dean asked eyeing her.
"What's it to ya" She said in her British accent.
"I'm the one with the gun!" He said.
"And if you harm her I will tear apart this universe to make your life a living hell!" The Doctor exclaimed threateningly.
"I'd like to see you try." Dean said.
"Rose, we're leaving. Get back into the Tardis." The Doctor instructed walking back into the blue box.
"Hey! Where do you think your going?" Dean yelled running at them with Sam right behind him.
As soon as he ran into the blue box his throat went dry and both Sam and Dean's eyes were as wide as planets.
"I-its b-b-bigger on th-the inside!" Sam said shockingly.
All Dean could do was just stare as the Doctor was at the center console flipping switches and pushing buttons like it was no big deal. Rose, on the other hand, was sitting in one of chairs staring at them and smiling.
"This is the Tardis or Time and Relative Dimension in Space. It can travel anywhere in time and space, it's dimensionally transcendental, and is alive!" He said ecstatically.
Both brothers were too stunned to reply as the Doctor hit the dematerialization switch and the Tardis groaned and disappeared into the time vortex.
"What did you do?" Dean finally managed to say.
"The Tardis is now in flight mode traveling through the time vortex." The Doctor explained.
"Wait, so we're flying?" Dean questioned tightening his grip on the rail beside him.
The Doctor nodded his head and Sam snorted, getting a glare from Dean.
"Shut up Sammy!" Dean exclaimed
"Wait, your nickname is Sammy?" Rose smirked teasingly.
Sam, blushing from embarrassment, nodded and said, "Only Dean calls me that."