"Dirty Girls" is the 18th episode of the seventh and final season of the television series Buffy the Vampire Slayer.
She accepts the assistance of a stranger wearing a priest's collar and driving a truck but is horrified to discover that she has fallen into a trap.
The young woman, now in her vampire form, attacks Faith who, borrowing a stake from Buffy, quickly slays her.
Back at the house, Faith encounters a cold reception from both Dawn and Giles, and Spike explains that the tension is not all because of her.
Alarmed by the obsession over her at the Summers' home, Faith sneaks down into the basement for a cigarette break, where Spike joins her.
Later at the house, Buffy tries to motivate the terrified Potentials to accompany her when she attacks Caleb (who, meanwhile, is re-enacting scenes of his past murders with the First Evil).
Leaving Willow and Giles to stay behind to protect the more inexperienced girls, Buffy leads Spike, Faith, Xander, and the more experienced Potentials (including Kennedy, Molly, Rona, Chao-Ahn, Amanda, Diane, and several others) to the vineyard; they divide into two groups: an assault team and a back-up team.