“The X-Files: I Want to Believe.” That’s the title of the second film based on the cult TV series, due in theaters July 25. Chris Carter, the series’ creator and the movie’s director and co-writer, told The Associated Press that the title was a natural. “I Want to Believe” was the slogan on a poster UFO-obsessed agent Fox Mulder (David Duchovny) had hanging in the cluttered basement office where he and FBI partner Dana Scully (Gillian Anderson) worked.