Prom Night (film series)

In the original Prom Night, a group of children–Wendy, Jude, Kelly, and Nick—inadvertently kill a young girl named Robin during a game. They make a vow of silence, and a sex offender is ultimately blamed for her death. Six years later, Robin's elder sister, Kim (Jamie Lee Curtis) and her fraternal twin brother, Alex, are planning to attend her senior prom at Hamilton High School. The prom falls on the sixth anniversary of Robin's death. Kim's father, the school principal (Leslie Nielsen) grows frightened when the sex offender escapes from a psychiatric facility the day before the school prom. Wendy, Jude, Kelly, and Nick receive obscene phone calls the day of the prom, and Jude, Kelly, and Wendy are dispatched in various violent manners during the dance by a killer dressed in a ski mask. Meanwhile, Kim and Nick are crowned prom queen and king. While waiting backstage before the reveal, Lou, a bully, takes Nick's crown from him. The killer, mistaking Lou for Nick, decapitates him, and his head rolls across the stage. A panic ensues among the promgoers, and Nick and Kim battle with the killer on the dance floor. Nick hits him in the side of the head with the blunt edge of the axe, and the killer stumbles outside. Kim follows him, unmasking him as he collapses outside, only to see that it is her brother, Alex—Alex had witnessed Robin's death, and sought vengeance against those responsible. Alex dies in her arms.

In the film's sequel, Hello Mary Lou: Prom Night II, a teenage girl, Vicki Carpenter (Wendy Lyon), is preparing to attend the 1987 senior prom at Hamilton High. While searching for a dress in the school's costume room, she discovers a trunk full of mementos and clothing that belonged to Mary Lou Maloney, a teenage student who was burned to death during a prank while being crowned prom queen in 1957. Vicki decides to wear the dress, inadvertently unleashing Mary Lou's vengeful spirit. Mary Lou possesses Vicki, and manipulates those around her, killing several of Vicki's friends along the way. She seduces Vicki's father before killing her mother. At the prom, Vicki attends with her boyfriend, Craig (Louis Ferreira), whose father, Bill (Michael Ironside)—the school principal—was Mary Lou's boyfriend who was responsible for the prank that killed her. As Vicki is crowned prom queen, Bill shoots her, after which her body morphs into the burned corpse of Mary Lou. Mary Lou wreaks havoc, but is placated when Bill places the crown on her head; she kisses him, and disappears. Vicki and Craig leave the prom with Bill, only to realize in his car that he is now possessed by Mary Lou.

Mary Lou returns in Prom Night III: The Last Kiss, seducing Alex (Tim Conlon), a handsome high school senior who, though an average student, aspires to go to medical school. She initially benefits him greatly, manipulating his grades at school and helping him become a football star. However, his relationship with the ghostly Mary Lou begins to take its toll on his relationship with real-life girlfriend, Sarah (Cynthia Preston). Meanwhile, Mary Lou indiscriminately kills anyone who comes in her way, eventually killing Alex's friend Shane. Alex is blamed for Shane's gruesome murder. Alex promises to go to Hell with Mary Lou if she promises to stop her reign of terror; she agrees, and he descends to hell with her, followed by Sarah. Sarah fights Mary Lou, and she and Alex appear to escape from hell, but Mary Lou reemerges and kills Sarah, leaving Alex in a time warp in the 1950s, where nobody can see or hear him.

Prom Night IV: Deliver Us from Evil diverges from the Mary Lou Maloney storyline, instead focusing on a group of teenagers who plan to forgo their prom and party at an abandoned seminary. Among them are Meagan (Nicole de Boer) and Mark (J. H. Wyman). Their party is crashed by Father Jonas, a Roman Catholic priest who murdered two students at the 1957 Hamilton High prom before being sequestered away by the church, apparently possessed by a demonic spirit. After Father Jonas kills most of Meagan's friends, she and Mark attempt to fight him, but Jonas stabs Mark to death with a crucifix. Meagan ultimately beats Jonas before leaving him to burn to death in a shed, though he awakens while being transported to the morgue.

In the 2008 remake of Prom Night, high school student Donna Keppel (Brittany Snow) is traumatized after Richard Fenton (Jonathan Schaech) becomes obsessed with her and murders her family. At her high school prom, held in a grand hotel, Fenton arrives and stalks her, disguised as a stranger, having escaped from incarceration. He murders several of Donna's friends before cornering her in the upstairs of the hotel. A chase ensues, but she is ultimately saved by Detective Winn (Idris Elba), who shoots Fenton to death.