If you're not back by midnight... you won't be coming home.

Prom Night - At a high school senior prom, a masked killer stalks four teenagers who were responsible for the accidental death of a classmate six years prior.
Hello Mary Lou: Prom Night II When Hamilton High's Prom Queen of 1957, Mary Lou Maloney is killed by her jilted boyfriend, she comes back for revenge 30 years later. Bill Nordham is now the principal of Hamilton High and his son is about to attend the prom with Vicki Carpenter. However, she is possessed by Mary Lou Maloney after opening a trunk in the school's basement. Now Bill must face the horror he left behind in 1957.
Prom Night III: The Last Kiss Mary Lou, the prom queen burned to death by her boyfriend back in the fifties, has escaped from hell and is once again walking the hallways of Hamilton High School, looking for blood. She chooses as her escort in world of the living Alex, an average depressed student with dreams of one day becoming a doctor. As Mary Lou begins to get back into form, the body count starts climbing and the graduating class of Hamilton High is once again smaller than expected.
Prom Night IV: Deliver Us from Evil Carrying on the Prom Night tradition, this film begins back at Hamilton High School on Prom Night in 1957. As a young couple are enjoying a romantic moment together in the back seat of a car, they are interrupted by Father Jonas, a priest who slashes and immolates the lovers. Thirty years later, Jonas gets loose from the chapel basement where the church fathers had been secretly keeping him locked up and drugged. As luck would have it, it's prom night again, and group of four students have unfortunately chosen Jonas's hideout as their secluded getaway spot.