The X-Files is the cult science-fiction supernatural television series created by Chris Carter (Millennium) that starred David Duchovny and Gillian Anderson as Fox Mulder and Dana Scully - FBI agents who were placed in a special unofficial assignment known as the 'X-Files', in which they investigate cases that are associated with the paranormal. Mulder, a true believer, had high interest in such cases, most particularly (and personally) those involving evidence of the existence of extraterrestrial life. Concurrently, the cases also included other strange and unexplained phenomenon, with Mulder purporting generally wild theories. Scully - a doctor, scientist and skeptic - was originally to scrutinize and dismiss said findings and find more logical conclusions. In time, both learn to trust each other in their mutual search for the truth even as they clash with an insidious, far-reaching conspiracy meant to deny and cover up much of these acts. Late in the series, they are joined in their investigations by agents John Doggett (Robert Patrick) and Monica Reyes (Annabeth Gish). The series also stars Mitch Pileggi, Nicholas Lea, and William B. Davis.
The X-Files aired for 9 seasons on the FOX network from 1993 to 2002, making it the longest-running North American science-fiction television series until surpassed by Stargate SG-1. It was produced in Vancouver, British Columbia for its first five seasons before moving production to Los Angeles, CA for its final four seasons. The series is also notable for being one the earliest TV shows to have a strong internet presence (in the days when the internet was considerably more rudimentary and less popular than now). The series would also spawn two feature films: 1998's The X-Files: Fight the Future and 2008's The X-Files: I Want To Believe, as well as the spin-off series, The Lone Gunmen.
The following lists the television series seasons and films set in the universe of The X-Files: