On Halloween, Dylan Wilde attends a party at a rival's house, enjoying his high school break with friends. However, his ex-girlfriend and classmate—the psychopathic Mandy Heartlock—assumes the persona of an otherworldly killer clown; in full costume, she stalks Dylan and attempts to kill the teens at the party, obsessed with the desire for him to return her love. Will Dylan and his friends manage to escape the Killer Clown?
