Who does the voice in the basement belong to?

Buffy Summers

"Don't mind me," said the young blonde girl smoking a cigarette at the far end of the basement. "I'm from L.A. I've seen far more strange stuff over there than I can ever hope to see here in Sunnydale -- though I must admit the big glowing hole in mid-air thing was kinda new."

"Oh my God!" exclaimed Kennedy, not even bothering to cover her naked body. "You're Buffy Summers."

"That's my name," said the girl. "You've heard of me?"

"Kinda," said Kennedy. "But why are you here down here instead up there in front of the high school? And since when do you smoke? And why do you have clothes on?"

"Who the heck are you?" asked Buffy. "The morality police? I can smoke down here if I want to. And why wouldn't I have clothes on? And why do you talk as if you know me? I've never seen you before in my life."

"You might remember me," said Amy. "We first met during your first year here at Sunnydale High."

"First year?" asked Buffy. "Heck, this is still my first day!"