The X-Files is an American Peabody, Golden Globe and Emmy Award-winning science fiction television series created by Chris Carter, which first aired on 10 September 1993, and ended on 19 May 2002. The show was one of the American FOX network's first major hits, and its main characters and slogans (e.g., "The Truth Is Out There," "Trust No One," "I Want to Believe") became pop culture touchstones. The X-Files is seen as a defining series of the 1990s, coinciding with the era's widespread mistrust of governments, interest in conspiracy theories and spirituality, and the belief in the existence of extraterrestrial life.

In the series, FBI agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) are tasked with investigating the "X-Files": marginalized, unsolved cases involving paranormal phenomena. Mulder plays the role of the "believer", having faith in the existence of aliens and the paranormal, while Scully is a skeptic, initially assigned by her departmental superiors to debunk Mulder's unconventional work. As the show progressed, both agents were caught up in a larger conflict, termed "the mythology" or "mytharc" by the show's creators, and developed a close and ambiguous friendship which many saw more as romantic than platonic. The X-Files also featured stand-alone episodes ranging in tone from horror to comedy, in which Mulder and Scully investigated uniquely bizarre cases without long-term implications on the storyline. These so-called "monster of the week" episodes made up the bulk of the series.

The show's popularity peaked in the mid-to-late 1990s, leading to a theatrical feature film in 1998. In the last two seasons, Anderson became the star as Duchovny appeared rarely, and new central characters were introduced: FBI Agents John Doggett (Robert Patrick) and Monica Reyes (Annabeth Gish). At the time of its final episode, The X-Files was the longest running sci-fi show ever on American television, a title since lost to cable's Stargate SG-1 . The show was declared by TV Guide to be the second greatest cult television show (Star Trek being number one) and the 37 th best television show of all time. In 2007, TIME magazine included the show on its list of the "100 Best TV Shows of All Time".

The X-Files is a 1998 science fiction film based on the television series of the same name.

"Fight the Future" is the film's subtitle and/or tagline. It was used to distinguish the motion picture from the television series. In many places, the phrase appears to be part of the film's title — for example, in promotional materials and on the cover and spine of the DVD packaging. However, the opening title and closing credit sequences within the motion picture, and the studio boilerplate on the DVD packaging and promotional posters, state the title of the film as simply The X-Files.

If viewed in the context of the X-Files chronology, the film takes place between seasons five and six of the TV series.

Two people from two worlds. FBI Agent Fox Mulder, a believer. FBI Agent Dana Scully, a Skeptic. Together they must solve the mysteries such as who, or what destroyed a Federal Building in Dallas, what killed 4 firemen and a child supposedly killed in the blast and more, but these mysteries were not placed by some insane terrorist, these were placed by our very own Government. Written by Kyle Keating

After The X Files is closed, Mulder and Scully now do the "down to earth work." They are assigned to find a bomb in a building. After the bomb destroys the building, Mulder soon learns that the destruction of the building was the work of the government... Written by yatessixecho

After five years of chasing paranormal activity, the X-Files are closed by the government. FBI Agent Fox "Spooky" Mulder and his skeptical partner, Dana Scully, are reassigned to more mundane duties...such as bomb detail. Even so, Mulder gets more and more information confirming his suspicions about alien activity on Earth and a secret, international cabal of men protecting that confidential information. An outbreak of metamorphic alien activity in Texas provides the clues for the agents. Written by Michael "Rabbit" Hutchison

Thirty-seven thousand years ago, a deadly secret was buried in a cave in Texas. Now the secret has been unleashed. And its discovery may mean the end of all humanity. When a terrorist bomb destroys a building in Dallas, Texas, FBI Agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) are drawn into a dangerous conspiracy surpassing anything they've ever encountered. With the dubious assistance of a paranoid doctor (Martin Landau), Mulder and Scully risk their careers and their lives to hunt down a deadly virus which may be extraterrestrial in origin - and could destroy all life on earth. Their pursuit of the truth pits them against the mysterious Syndicate, powerful men who will stop at nothing to keep their secrets safe, leading the agents from a cave in Texas, to the halls of the FBI, and finally to a secret installation in Antarctica which holds the greatest secret of all. Written by Robert Lynch

This television series follows the adventures and lives of FBI agents investigating those cases that involve the paranormal or previously unsolved (especially by conventional means). FBI Special Agents Mulder, Scully, Doggett and Reyes work to uncover forces within the United States of America government that would violate people's rights, alien creatures and monsters alike that attack and other mysteries. Written by Lee Jamilkowski

FBI agents Fox Mulder and Dana Scully are not the same at all. Mulder is a believer in the paranormal while Scully is not. Together, they investigate paranormal cases which takes them all the way to alien conspiracies within our government and even puts their lives and careers at risk. Together, they try to solve the mysteries within our government, no matter what they have to do, and along the way they try to solve any other case that's related to the paranormal. Written by yatessixecho

Fox (Don't call me Fox) Mulder is a believer in the paranormal. He has been assigned to the X-Files unit which investigates FBI cases for which standard investigatory techniques don't seem to work. Dana Scully, a medical doctor and FBI agent is a skeptic. Together they travel to FBI cases where something odd has happened. Written by John Vogel