Slumber Party Massacre III
(1990)
After a hard day of volleyball at the beach, a teen whose parents are away decides to have a slumber party with her girlfriends. Their boyfriends predictably show up to scare them, but a stranger from the beach is also seen lurking around the house. Soon the group begins experiencing an attrition problem. Written by Ed Sutton School's out - everyone heads to the beach - a typical vacation. However, a mysterious murderer armed with a drill is killing people, yet at the beginning nobody notices him 'till it's too late. Meanwhile, a group of teenage girls decide to have a slumber party, and some of their boyfriends drop by. Soon, people begin to disappear. Then, an all out drill massacre begins... Written by Parca Mortem