Jerry is a vampire, who moves next door to Charley Brewster, a vivid horror movie fan. Charley eventually finds out who and what Dandridge truly is after watching him attempt to bite a woman while making love. Eventually Jerry discovers, that Charley knows and attempts to kill him in his room, but is wounded in the hand with a pencil. He wrecks Charley's car in a rage and threatens to kill him the next night. A scared Charley calls in to vampire-hunting hero, actor Peter Vincent, but he dismisses Charley as an obsessed fan. Amy, Charley's girlfriend, and "Evil" Ed, Charley's best friend, begin to worry about his sanity, and they persuade Vincent to perform a fake test with "holy water" (which is actually tap water) to prove once and for all that Dandridge is not a vampire in order to calm