Slumber Party Massacre (2021)

In 1993, Trish Devereaux is having a slumber party in a cabin in Holly Springs, California, with friends Jackie, Kim, and Diane. After arriving to confront Trish, her ex-boyfriend Chad looks through a window, sees the girls dancing, and begins to masturbate. Russ Thorn, a killer who uses a power drill, soon murders him. Russ then makes his way inside the cabin, killing Kim, Diane, and Jackie in the process. After getting drilled through her hand, Trish hits Russ with an oar, sending him inside the lake. It is believed that Russ drowned, but his body is never found.

In present-day L.A., Trish's daughter, Dana, is heading out for a girls' weekend with her best friends, Maeve, Breanie, and Ashley. En route, the girls learn that Maeve's younger sister, Alix, had stowed away. The girls reluctantly let Alix join them, as they are on their way to the house they rented. Their car breaks down in the renamed Jolly Springs. After seeing an ad for a cabin for rent that night, the girls talk to Kay, the owner of the general store and the cabin. Kay reluctantly lets the girls rent the cabin, but warns them to stay quiet and still. As the girls start dancing, Alix gets bored and goes out for a walk. She soon finds a truck in the middle of the road. Its owner is dead, and his eyes were drilled out. Alix returns to the cabin and recounts what she saw. The other girls then reveal to sport weapons such as knives and baseball bats. They know Russ Thorn is still alive and have set everything up in an attempt to bait him out and kill him once and for all after twenty more victims have fallen since Trish's encounter.

John and Matt, two guys from a cabin across the lake, then arrive. John is a fan of a crime podcast; he and his buddies have rented out the actual cabin where Russ Thorn killed Trish's friends. Noticing the weapons, Matt freaks out and leaves with John. Dana and Maeve realize that Russ could go after the guys. The guys return to the cabin and talk to Sean, Guy 1, and Guy 2. Guy 1 decides to go for a walk outside the cabin and sees Russ Thorn, who breaks out the drill and kills him. When the girls arrive at the guys' cabin, Russ turns off the lights and, during the chaos, murders Guy 2. Sean grabs his guitar while Matt and John grab the legs of their chairs and go after Russ, despite the girls' warning. As Dana encounters Russ, a chase leads to Sean getting drilled in the face. Russ follows Dana to her cabin and attempts a sneak attack, but is soon met by the girls, who kill him together.

The next morning, Matt is killed while taking a shower. Meanwhile, while the other girls attempt to call the police, Alix is forced to watch Russ's body, but begins to get violently ill from a tin of cookies gifted the night before. While attempting to fix Maeve's SUV, Ashley is murdered by Matt's killer. The others discover that Russ' body has disappeared and see Ashley's corpse, before being attacked by her assailant, who uses a nail gun. Breanie is killed by a nail to her eye.

As Dana looks for help, she is confronted by John, who thinks that she is responsible for Matt and Guy 1's deaths. Dana pleads with John to leave together to get help, but he ends up ditching her. Dana later finds Kay, who is revealed to be the one who killed Matt, Ashley, and Breanie. She is Russ Thorn's mother and seeks revenge. Kay goes after Dana, Maeve, and Alix, but Trish then arrives and starts a fight with her. Kay uses a blade against Trish's injured hand, but its nerves are completely damaged and she cannot feel pain. Dana gives Trish Russ' broken drill bit, which Trish uses to stab Kay. As Kay dies, Trish, Dana, Maeve, and Alix hug.