The Lone Gunmen, the third series in the X-Files franchise, follows the established characters of Richard Langly, Melvin Frohike and John Fitzgerald Byers (Bruce Harwood, Tom Braidwood, and Dean Haglund), in their attempts to compile conspiracy-theorist magazine.
The X-Files has crossed over with both Millennium and The Lone Gunmen, as well as The Simpsons (in the season 8 episode "The Springfield Files").