Happy Death Day

Happy Death Day is a 2017 American black comedy slasher film directed by Christopher Landon and written by Scott Lobdell. It stars Jessica Rothe and Israel Broussard. The film follows college student Tree Gelbman, who is murdered on the night of her birthday but begins reliving the day repeatedly, at which point she sets out to find the killer and stop her death. Jason Blum serves as a producer through his Blumhouse Productions company.

Happy Death Day was released by Universal Pictures on October 13, 2017, and received generally mixed reviews. It grossed $125.5 million worldwide on a $4.8 million budget. A sequel, Happy Death Day 2U, was released on February 13, 2019.

After a night of drunken partying, Tree Gelbman wakes up on her birthday in the dorm room of classmate Carter Davis. She dismisses him, returning to her room. Her sorority housemate Lori Spengler gives her a cupcake, which she throws away. Tree meets with her married professor, Gregory Butler, with whom she is having an affair. That night, on her way to a party, Tree is lured into a tunnel and murdered by a figure wearing a mask.

She immediately wakes up back in Carter's bed and is unnerved to find the previous day's events repeating themselves. Baffled, she relives the day, this time avoiding the tunnel and reaching the party. However, the masked killer follows her and murders her again. Tree again wakes up in Carter's bed, realizes she is in a time loop, and barricades herself in her room to avoid death. The killer, already hiding inside, murders her a third time.

Waking up, Tree explains the events to Carter. He suggests taking advantage of the loop to identify her killer. She spends the next several iterations trailing suspects but she is killed each time. After waking from a loop where she is bludgeoned, Tree faints and awakens in the campus hospital. When the killer shows up, she escapes the hospital in Gregory's car, only to be pursued and killed again.

Back in Carter's bed, Tree convinces him of her predicament by demonstrating her knowledge of the day's events. She sees a news report on John Tombs, a serial killer being held at the campus hospital. Concluding that Tombs is her killer, she rushes to the hospital to warn of his escape.

Tombs breaks free and nearly kills Tree, but Carter follows and rescues her. Tombs kills Carter before chasing Tree to a bell tower, where she subdues him with a crowbar. Before delivering a fatal blow, she realizes that if she kills Tombs and ends the loop, Carter will remain dead forever. She runs to the top of the tower and hangs herself from the bell rope.

Tree awakens in Carter's dorm room and finds him alive again. Now confident in solving her murder, she proceeds happily through the day. She ends her affair with Gregory and meets her father for lunch, where they begin to reconcile. That night, she goes to the hospital and traps and kills Tombs. Relieved to be free, she celebrates her birthday in Carter's room and eats the cupcake Lori gave her.