Buffy is settling in to her counselor's role at the high school helping troubled teens and sorting out problems, but is left speechless when Cassie, a student, comes to her and calmly tells her that she (Cassie) has only a week to live. Suspecting the girl is suicidal, Buffy investigates and discovers a cult of students playing with dark forces and comes to believe Cassie is psychic.
"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.