While unknowingly participating in a spell with the wish-granting demon Anyanka in order for her to get her powers back, Willow accidentally brings forth the vampire Willow from Cordelia's alternate universe. The vampire Willow sets her sights on turning Sunnydale into the vampire-ruled world she knows but when she learns of her counterpart, she decides to make Willow send her back. After trying to seduce Willow and freaking her out a bit, the vampire Willow is captured. The real Willow, dressed in her doppelganger's outfit, attempts to stop the ensuing slaughter at the Bronze and is almosthuged by the vampire Willow before Buffy saves her. Giles and Anya successfully send the vampire back to her world but she arrives at the exact same moment she left, right before she is staked by Oz.
"Into every generation, there is a chosen one. She alone will stand against the vampires, the demons, and the forces of darkness. She is the slayer".
When a young vampire slayer by the name of Buffy Summers, moves to Sunnydale, California, she quickly finds out that Sunnydale is located right on top of the Hellmouth - the center for all evil activity. Her new watcher, Rupert Giles, also happens to be the school librarian. It is his job to train her and guide her in all the skills she needs to be a Slayer. She and a group of close friends, commonly referred to as "The Scooby Gang", help her in her battle against evil.