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.

Christopher Carl Carter is an American television and film producer, director and writer who gained fame in the 1990s as the creator of the Fox science fiction supernatural drama series The X-Files.