"Invocation" is the fifth episode of the eighth season of the American science fiction television series The X-Files. It premiered on the Fox network on December 3, 2000. The episode was written by David Amman and directed by Richard Compton. "Invocation" is a "Monster-of-the-Week" story, unconnected to the series' wider mythology. The episode received a Nielsen rating of 8.2 and was viewed by 13.9 million viewers.