It's going to be the slumber party to end all slumber parties. With her parents away, Trish (Michelle Michaels) is planning a weekend of high jinx fun for her high school basketball team friends - a slumber party at her house. She's not sure if she wants to invite the newly arrived and talented Valerie (Robin Stille) but someone who's definitely coming is Russ Thorn. Locked up in a mental institution since 1969, Thorn, the nastiest of driller killer psychos, has escaped and is heading back to town intent on more bloody mayhem. This night no one's going to get much sleep - there's potato chips, drinks, dope, severed heads, blood and gore a-plenty. Even the pizza delivery boy ends up a yucky mess (just like his pizzas!).