Rose glanced at the Doctor, who was still frozen in shock. Then, she glanced back at the man standing in front of them who was clearly not the Doctor.
The actual Doctor was the first one to break the ice. "Er, hello. I'm...the Doctor. And you are...?"
"Crowley."
The two just stared at each other in silence for a few moments, but Rose wasn't having any of it. She wanted to know why this man looked so much like the Doctor, and why he was in the TARDIS.
"So, Crowley, any idea why you look exactly like the Doctor?" Rose gestured towards the Time Lord in question.
"Er, I'm actually not sure," Crowley blatantly stated.
All of a sudden, the Doctor had a realization. "OH!" he shouted, the force of it making everybody in the immediate vicinity jump (even though Crowley would never admit that he had been startled by a 900 year old absolute child that had somehow found his way into the TARDIS supply of hair gel a week ago). "That's it! We've landed in a different universe!"
"Yeah, and?" Rose responded.
"Well there's enough of me for one universe, but in this universe there's no me going around and saving people and planets, so Crowley here is my counterpart in this universe!"
"That makes sense. He does look exactly like you, after all..." Rose paused. "Wait, does that mean he's not human too?"
"You're right," Crowley started slowly. He didn't usually just tell stuff like this to people he just met. "I'm not human. I'm a demon."
Rose tilted her head a bit in response to that like she'd seen weirder. Which, in their case, she and the Doctor actually had because they just got back from fighting the literal devil from their universe. Wait, does that mean that there are multiple devils? She thought.
Crowley rolled his eyes at everyone's lack of a reaction. That's fine if they're not surprised. Instead of perpetuating the awkward silence that that had generated, the demon turned towards the Doctor. "So if you're not human, that what are you?"
It was at that moment that Aziraphale had decided to walk in on their little conversation.
