THE SLUMBER PARTY MASSACRE

In Venice, Trish Deveraux, an 18-year-old high school senior, decides to throw a slumber party while her parents are away. Their neighbor, Mr. David Contant, is given the job of checking on the girls. She awakes and gets dressed shortly before going to school. Meanwhile, Russ Thorn, an escaped serial killer, kills a telephone repairwoman and steals her van. Trish meets up with her friends Kim, Jackie, and Diane. She invites the new girl, Valerie, to the party, but Valerie declines. After school, one of their classmates, Linda, goes back into the school to retrieve a book but gets locked inside. She is attacked and presumably killed by Russ, armed with a power drill. As the party begins that night, the girls use marijuana and alcohol, while Valerie babysits her younger sister, Courtney, across the street. Two boys from school, Jeff and Neil, arrive and spy on the girls while they change clothes. Russ kills Mr. Contant outside with his power drill. Diane asks Trish permission to go with her boyfriend, and goes to his car to find him decapitated. She is then murdered as well.

The girls order pizza and, while on the phone with their coach, Rachel Jana, the girls answer the door and find the pizza delivery man with his eyes drilled out. The teens arm themselves with knives as Jeff and Neil run for help, but both boys are killed. Russ gains entry to the house and murders Jackie. Trish and Kim barricade themselves in Trish's bedroom, but Russ enters through a window and kills Kim as Trish flees. Valerie and Courtney enter the house to find Kim dead and hide from Russ. Coach Jana, having become concerned after the earlier phone call, arrives and is confronted by Russ, who disembowels her with the drill. Valerie chases Russ with a machete, eventually severing his hand before slicing his stomach. Russ falls into a swimming pool and sinks beneath the water, only to emerge moments later and attack them again, but Valerie finally kills him with the machete. Valerie and Trish break down in tears as Courtney looks on in shock.

Valerie ultimately kills Russ Thorn, the escaped serial killer, with a machete after he attacks her, her sister Courtney, and Trish. The survivors are left traumatized as the night ends.

The climax delivers on the slasher promise, with the killer repeatedly returning despite apparent defeat until Valerie decisively ends his threat. The film closes with the surviving girls visibly shaken, underlining the intense psychological toll and subverting the usual final-girl triumph with a moment of exhausted grief. This resolution cements the film’s blend of genre convention and darkly playful tone.