The X-Files: I Want to Believe is a 2008 American supernatural thriller film directed by Chris Carter and written by both Carter and Frank Spotnitz. It is the second feature film installment of The X-Files franchise created by Carter, following the 1998 film. Three main actors from the television series, David Duchovny, Gillian Anderson, and Mitch Pileggi, reappear in the film to reprise their respective roles as Fox Mulder, Dana Scully, and Walter Skinner.

The ninth season of the American science fiction television series The X-Files commenced airing in the United States on November 11, 2001, concluded on May 19, 2002, and consists of twenty episodes. The season takes place after Fox Mulder goes into hiding, following the events of the eighth season finale, "Existence". As such, the main story arc for the season follows Dana Scully, John Doggett, and Monica Reyes on their hunt to reveal a government conspiracy involving the elaborate and malevolent creation of "Super Soldiers".