Synopsis by Mark Deming
A group of students about to graduate from high school find they may never get a chance to use all they learned in algebra class when a violent lunatic arrives on the scene in this horror-thriller. It's the last day of high school and to celebrate, a group of seniors have assembled for a big end-of-the-year dance being held in the auditorium. Some of the students are having fun at the party, while others are rigging booby-traps and setting up pranks to surprise the teachers, but in time they discover the festivities have attracted an uninvited guest. A multiple murderer and sexual deviant has escaped for a nearby mental institution, and he's arrived at the school with rape and murder on his mind. After the escapee has trapped the students in the school, he begins picking them off one by one as the kids try to find a way to trap the killer before he can claim more victims. Produced in Germany (where it was released as Schrei -- denn ich werde dich töten), School's Out was imported to America by the editors of noted horror film magazine Fangoria, and dubbed into English.
dance [social event], gym, maniac, mental-institution, psychopath, serial-killer, sexual-deviation, victim