"The Lost Art of Forehead Sweat" is the fourth episode of the eleventh season of The X-Files. It is written and directed by Darin Morgan.
The episode explores “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.
- David Duchovny as Special Agent Fox Mulder
- Gillian Anderson as Special Agent Dana Scully
- Mitch Pileggi as Assistant Director Walter Skinner
- Brian Huskey as Reggie