Prom Night is a Canadian slasher film franchise that comprises a total of five feature films, the first four of which are centered around events at the fictional Hamilton High School. The first film, Prom Night (1980), was a slasher film directed by Paul Lynch and produced by Peter R. Simpson, focusing on teenagers being stalked and murdered by a masked killer at their prom. The film was a box-office success, grossing nearly $15 million. The following sequel, Hello Mary Lou: Prom Night II (1987), was envisioned as a standalone film, but producer Simpson and his company, Simcom, refitted it as a sequel to the original Prom Night. Hello Mary Lou: Prom Night II, a supernatural-themed slasher film, introduced the character of Mary Lou Maloney, a vengeful young woman who died on her prom night in 1957; its only connection to the first film was that both films take place in the same high school.