A 1976 American B-movie slasher film, Drive-In Massacre follows two police detectives investigating a series of gruesome murders targeting couples and lone women at a rural California drive-in theater, where an unseen assailant uses a sword to kill his victims with precision and brutality. As the detectives close in on their suspect, they realize that nothing is as it seems and that the true nature of the killer's identity and motives are shrouded in mystery. The film builds towards a shocking climax, culminating in a haunting finale that leaves the audience unsettled and questioning what lies ahead.