Season 3 Episode 1
Episode aired september 29, 1998
buffy -- living on her own in a big city -- assists a girl whose boyfriend has mysteriously vanished. back in sunnydale, buffy's friends do their best to battle the forces of evil without her.
the scene in school at the beginning, from about 6:43 to 10 minutes on dvd, is all filmed in a single take. from the library, through the cafeteria to the hallway, with six main actors, about a hundred extras and nearly fifty lines of dialogue.