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Exploring the idea of The Mandela Effect, in which large groups of people remember an alternate history, Mulder and Scully find out how the X-Files themselves may really have originated.
A spate of deaths, in which the victims were plagued by their own doppelgangers, lead Mulder and Scully to a pair of twins playing a dangerous game.
When a pair of teenage girls attack one another, each believing the other to be a monster, Mulder and Scully find that their investigation could possibly lead back to their long-lost son, William.
The season's storyline picks up directly after last season's finale.