The X-Files:The official site with an episode guide, live chat, episode previews, and a complete database with biographies of the characters, interviews, and awards. [Flash]
BBC - X Files: Featuring interviews, photo galleries, quizzes, quick facts and information about the show.
Fortress of Loligo: Essays about the show and its characters, drawn from posts to the alt.tv.x-files news group.
IMDb: The X-Files: Cast and crew details from the Internet Movie Database.
The Science Behind The X-Files: Takes an episode-by-episode look at the science fact behind the science-fiction of the television show. Covers the first six seasons.
The X-Toys: Gallery of custom action figures, Little People, and other toys. Also pictures toys based on Millennium.
TV Tome: The X-Files: Contains cast and crew information and episode guide.
Virgin.net - X-Files: Featuring character biographies, interactive quiz, and season seven DVD review.
White Noise: The Music of The X-Files: Lyrics to songs featured in the series and the film, along with information about composer Mark Snow. Also includes fan art.
X-Files Comics Checklist: Chronological list of comic books, with summaries and descriptions.