Buffy the Vampire Slayer season 7 episode 13
Episode title: The Killer in Me
After Willow and Kennedy share their first kiss, Willow is transformed into Warren, the man she killed last year. When she sets out to find help, she bumps into an old friend. Meanwhile, Buffy searches for answers when Spike's chip causes him great pain, and the gang suspect that Giles may really be The First Evil.
