After the gang finds out about Buffy's true afterlife, Willow does a spell to make her forget that she was actually in heaven. Unfortunately the spell goes awry and the gang all wake up with amnesia, forgetting everything about their lives including the existence of vampires and the Slayer. Because of their British accents, Giles and Spike ("Randy") think they are father and son, Giles and Anya think they are engaged, Willow and "Alex" think they are dating, and due to the absence of ID, Buffy names herself Joan. When a demon loan shark comes to collect a long overdue loan from Spike, "Joan" and "Randy" discover their true nature when they are forced to fight, while Dawn, Willow, Tara and "Alex" head out to try and restore their memories. At episodes end when they get their memories back the gang goes through some changes, with Tara breaking up with Willow and Giles finally leaving Sunnydale behind forever.
"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.