College student Ryan wakes up in his car on Tuesday, September 19. Returning to his dorm room, he walks in on his roommate Carter and Carter's girlfriend Tree. He resumes work on an experimental quantum reactor with fellow students Samar and Dre. After Bronson, the school dean, shuts down the project for triggering several power outages, Ryan is murdered by someone dressed as Babyface, and wakes up again on Tuesday the 19th. Tree explains her experience Happy Death Day#Plot, and she and Carter agree to help Ryan. They learn the reactor was responsible for creating the loop. The new Babyface tracks Ryan down, but Tree subdues and unmasks him to reveal another Ryan. The second Ryan warns that the original must die for the loop to close. Terrified, Ryan activates the reactor, releasing a powerful energy pulse that knocks everyone unconscious.

A college student must relive the day of her murder over and over again, in a loop that will end only when she discovers her killer's identity.

A recently released inmate from a mental asylum learns from his sister that the murders he was convicted of committing were actually orchestrated by a supernatural entity, the Lasser Glass mirror.

A young woman grieving the loss of her mother, a famous scream queen from the 1980s, finds herself pulled into the world of her mom's most famous movie. Reunited, the women must fight off the film's maniacal killer.

A young couple staying in an isolated vacation home are terrorized by three unknown assailants.

The Lamberts believe that they have defeated the spirits that have haunted their family, but they soon discover that evil is not beaten so easily.

Two New Orleans paramedics' lives are ripped apart after they encounter a series of horrific deaths linked to a designer drug with bizarre, otherworldly effects.

A woman with a mysterious illness is forced into action when a group of terrorists attempt to hijack a transatlantic overnight flight.

As kids, they escaped a UFO death cult. Now, two adult brothers seek answers after an old videotape surfaces and brings them back to where they began.

In five episodes, failed architect and vicious sociopath Jack recounts his elaborately orchestrated murders -- each, as he views them, a towering work of art that defines his life's work as a serial killer in the Pacific Northwest.