The X-Files was once one of the biggest shows on TV. The Sci-Fi nature, mysterious alien story lines, and the on screen chemistry between David Duchovny and Gillian Anderson (Fox Mulder and Dana Scully) was incredible. Fans of The X-Files tuned in week after week to see their favorite Agents search for UFO's. But late in the shows run its star David Duchovny's Fox Mulder seemed to disappear. Why did The X-Files seemingly get rid of their biggest star?