The Slumber Party Massacre trilogy is an aptly titled series that delivers exactly what it suggests; a massacre that occurs during a slumber party. All three films were written and directed by women, earning the trilogy a reputation for being a feminist take on the slasher.
Trish Devereaux-Craven, an 18-year-old high school senior, decides to throw a slumber party while her parents are away for the weekend. Their neighbor, David Contant, is given the job of checking in on the girls during the night. She awakes to the sound of her radio and gets dressed shortly before going to school. Meanwhile, Russ Thorn, an escaped mass murderer with a preference for power drills, kills a telephone repair woman and steals her van. Trish meets up with her friends Kim, Jackie, and Diane, the girls on her basketball team. A new girl, Valerie Bates, is invited by Trish, but refuses after hearing Diane talking cruelly about her. Russ watches the girls leave school from the van and a girl, Linda, goes back inside the school to retrieve a book for a test, only to be locked inside and attacked by Russ, who injures her left arm. She eventually hides in the shower room, but the killer finds out where she is because of her blood loss, and kills her before escaping to the van.
Courtney Bates, who survived "The Slumber Party Massacre" as an adolescent, is now a senior in high school who is plagued by night terrors stemming from the event. In her nightmares, she is recurrently confronted by the killer, now reincarnated as a Greaser armed with a guitar fashioned with a massive drill bit on the Neck. At school, Courtney takes a liking to her classmate, Matt, and invites him to spend her birthday weekend with her and her friends, Amy, Sheila, and Sally. They plan to stay at a condominium in an undeveloped complex outside town where the girls, who have their own band, can practice music.
Jackie Cassidy and her friends are stalked by a serial killer while having a slumber party.