Major narrative twists define the overarching mythology across the franchise:
- Murder House: Violet Harmon commits suicide with sleeping pills mid-season; her spirit remains trapped in the house unaware of her own demise. Vivien Harmon gives birth to twins, one fathered by the ghost Tate Langdon in the rubber suit, producing Michael Langdon—the Antichrist.
- Asylum: The seemingly benevolent court psychiatrist Dr. Oliver Thredson is exposed as the serial killer "Bloody Face," while Sister Mary Eunice is possessed by the Devil and Dr. Arden is unmasked as a Nazi war criminal. Lana Winters survives Briarcliff and ultimately shoots her adult serial-killer son Johnny point-blank.
- Coven: Cordelia Goode, long subjugated by her mother Fiona, passes the trials of the Seven Wonders to become the Supreme Witch, leaving Fiona to die of cancer and awaken in a personal purgatory.
- Freak Show: Dandy Mott massacres the carnival troupe; Pepper is framed for murder and committed to Briarcliff Manor in 1962, establishing the canonical link to Asylum.
- Hotel: Detective John Lowe is revealed to be the Ten Commandments Killer he was pursuing, manipulated by hotel founder James Patrick March.
- Roanoke: The mid-season twist reveals the conclusion of the docudrama "My Roanoke Nightmare," returning the actors and real-life subjects to the farmhouse where nearly all are slaughtered during the Blood Moon.
- Apocalypse: Michael Langdon triggers a nuclear apocalypse. The surviving witches enact Tempus Infinitum; Mallory travels back to 2015 to kill young Michael, resetting the timeline—though a new Antichrist child is subsequently born, confirming an endless cyclical threat.