This season is set in modern times, based on the story of the third season "Coven". After a nuclear explosion completely destroyed the world, people built an underground safe haven called "Outpost 3" to protect survivors with powerful genetic combinations. Venable (Sarah Paulson) and Ms. Mead (Kathy Bates) are the masters of Outpost 3 and have a set of strict rules for the management of the outpost. The residents of the outpost, including Galant (Evan Peters), the rich girl Coco (Leslie Grossman), Coco's assistant Mallory (Billie Lourd), the host Dinah Stevens (Adina Porter), etc., survive under the cruel rule of Venable and Ms. Mead. Soon after, the arrival of the Antichrist Michael Landon (Cody Fern) broke the peace of the outpost: he wanted to select worthy people and bring them to the "sanctuary" with better conditions. But Michael is not a kind person. He poisoned the residents of the outpost at the party. Then, the former witches appeared - they came to the outpost with the determination to eradicate Michael and declared war on Michael... Two years before the "Apocalypse", the Supreme Witch Cordelia (Sarah Paulson) found that her magic was gradually disappearing. At this time, she noticed that the appearance of the new wizard Michael Landon at the wizard school was probably the reason for her gradual weakening. Soon Cordelia discovered his conspiracy to destroy the world. In order to stop him from succeeding, Cordelia found her sisters, Myrtle (Frances Conroy), Zoe (Taissa Farmiga), Madison (Emma Roberts), Queenie (Gabourey Sidibe), Misty (Lily Rabe), and the new Mallory. For the safety of the witches, Cordelia erased Coco and Mallory's memories and hid their witch identities in order to infiltrate the outpost. The war between witches and the devil's children is about to break out...