Two
The Doctor narrowed his eyes. "Slayer?"
She nodded. "Never heard of me? Alright. She called you 'Doctor,' but something tells me you're not the traditional sort. Doctor Who?"
He smiled knowingly. "That is the question isn't it?"
Amy sighed heavily. "So sorry to interupt your flirting married man, but what was that thing?"
The blonde girl narrowed her eyes. "And who are you?"
"I'm Amelia Pond." She said somewhat defensively.
"Buffy."
The Doctor eyed them both and then started to fidget. "Umm- yes - sorry, but what was that thing?"
Buffy sighed. "It was a demon. A vampire if you want to be specific."
The Doctor glanced at Amy. "A vampire? Where did it come from?"
She looked at them. "Hell probably. That's where most demons around here come from."
The Doctor nodded quietly. "How odd? I usually deal with things that come from above us rather than below."
"You some sort of priest." He shrugged. "Not that kind of above."
"Buffy! I was looking for y-" A redhead skidded to a stop and a boy stopped beside her. "Buffy? Who's this?"
The Doctor stepped forward and held out his hand to them both. "I'm the Doctor and this is Amelia Pond!"
The redhead reached out her hand slowly to him. "I'm Willow and this is Xander."
"Willow. What a name and Xander. Is that spelled with a Z or and X? So good to meet you both."
Buffy cut him off. "I don't know who they are. We just met." The Doctor nodded. "Yes, but I have a feeling we'll be seeing a lot of each other as of late. Things to do! See you in a bit slayer!"