Buffy and the gang find themselves in a haunted house on Halloween when they go to a frat party that has an uninvited guest---a powerful fear demon. The evil power traps the partygoers inside and forces them to face their worst fears: Xander becomes invisible; Willow can't control her magic; Oz succumbs to his werewolf nature; and Buffy faces the people she couldn't save. Anya: Emma Caulfield. Riley: Marc Blucas. Joyce: Kristine Sutherland. Willow: Alyson Hannigan. Giles: Anthony Stewart Head. Xander: Nicholas Brendon.