20th Century Fox is an actual major movie studio based in Hollywood. It is part of News Corporation, one of the world's largest media conglomerates.
The X-Files proved popular during its first run broadcast and the executives at Fox asked Carter to develop another series that would run simultaneously with his first show. In response, Carter developed Millennium, a series that he pitched to Fox as "Seven set in Seattle".
Millennium was first broadcast in 1996. While it continued its initial run, 20th Century Fox released an X-Files movie in 1998. However, Fox decided to cancel Millennium the following year.
In 2001, The Lone Gunmen – another spin-off of The X-Files – was briefly broadcast. Although the show's ratings were actually higher than the first-season ratings of The X-Files, only thirteen episodes were broadcast with the last episode airing four months after the pilot episode.
The following year, The X-Files suffered a similar fate when it was canceled due to faltering ratings.