"Demons" is the twenty-third episode of the fourth season of the American science fiction television series The X-Files. It premiered on the Fox network in the United States on May 11, 1997 and in the United Kingdom on BBC One on February 25, 1998. It was written by R. W. Goodwin and directed by Kim Manners. The episode helps explore the series' overarching mythology. "Demons" received a Nielsen rating of 11.8, being watched by 19.1 million viewers in its initial broadcast.