|A teenage girl hosts an all-girl, drug-fuelled party at her parents' house one night. One by one the guests start getting picked off by an escaped killer lurking in the shadows.|
Poorly made trashy horror movie from the early 80s when this genre was at the height of its popularity. One scene in particular which I found quite cold was when one of the girls doesn't let the pizza go to waste!
See also Slumber Party Massacre II (1987), and Slumber Party Massacre Part III (1990).