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The mythology of The X-Files, sometimes referred to as its "mytharc" by the show's staff and fans, follows the quest of FBI Special Agents Fox Mulder (David Duchovny), a believer in supernatural phenomena, and Dana Scully (Gillian Anderson), his skeptical partner. Their boss, FBI Assistant Director Walter Skinner, was also often involved. Beginning with season 8, another skeptic named John Doggett, and Monica Reyes, a believer like Mulder, were also introduced. The overarching story, which spans events as early as the 1940s, is built around a government conspiracy to hide the truth about alien existence and their doomsday plan. Not all episodes advanced the mythology plot, but those that did were often set up by Mulder or Scully via an opening monologue.
Most mythological elements in The X-Files relate to extraterrestrial beings, referred to by the writers as "Colonists", whose primary goal is to colonize Earth. Late in the series, this was revealed to have been planned for the year 2012.
Episodes
This list of mythology episodes was originally taken from official sources, The X-Files Mythology range of DVDs and the book The Complete X-Files: Behind the Series, the Myths and the Movies.[1]
 | This section needs additional citations for verification. (February 2019) |
| # in season | Title | Original Air Date | Notes |
|---|---|---|---|
| Season 1 | |||
| 1 | Pilot | September 10, 1993 | |
| 2 | Deep Throat | September 17, 1993 | |
| 10 | Fallen Angel | November 19, 1993 | |
| 17 | E.B.E. | February 18, 1994 | |
| 24 | The Erlenmeyer Flask | May 13, 1994 | |
| Season 2 | |||
| 1 | Little Green Men | September 16, 1994 | |
| 5 | Duane Barry | October 14, 1994 | |
| 6 | Ascension | October 21, 1994 | |
| 8 | One Breath | November 11, 1994 | DVD only |
| 10 | Red Museum | December 9, 1994 | |
| 16 | Colony | February 10, 1995 | |
| 17 | End Game | February 17, 1995 | |
| 25 | Anasazi | May 19, 1995 | |
| Season 3 | |||
| 1 | The Blessing Way | September 22, 1995 | |
| 2 | Paper Clip | September 29, 1995 | |
| 9 | Nisei | November 24, 1995 | |
| 10 | 731 | December 1, 1995 | |
| 15 | Piper Maru | February 9, 1996 | |
| 16 | Apocrypha | February 16, 1996 | |
| 24 | Talitha Cumi | May 17, 1996 | |
| Season 4 | |||
| 1 | Herrenvolk | October 4, 1996 | |
| 7 | Musings of a Cigarette Smoking Man | November 17, 1996 | |
| 8 | Tunguska | November 24, 1996 | |
| 9 | Terma | December 1, 1996 | |
| 14 | Memento Mori | February 9, 1997 | |
| 17 | Tempus Fugit | March 16, 1997 | |
| 18 | Max | March 23, 1997 | |
| 21 | Zero Sum | April 27, 1997 | |
| 23 | Demons | May 11, 1997 | Book only |
| 24 | Gethsemane | May 18, 1997 | |
| Season 5 | |||
| 1 | Redux | November 2, 1997 | |
| 2 | Redux | November 9, 1997 | |
| 6 | Christmas Carol | December 7, 1997 | Book only |
| 7 | Emily | December 14, 1997 | Book only |
| 13 | Patient X | March 1, 1998 | |
| 14 | The Red and the Black | March 8, 1998 | |
| 20 | The End | May 17, 1998 | |
| The X-Files: Fight the Future
(feature-length film set between Seasons 5 and 6) | |||
| Season 6 | |||
| 1 | The Beginning | November 8, 1998 | |
| 9 | S.R. 819 | January 17, 1999 | |
| 11 | Two Fathers | February 7, 1999 | |
| 12 | One Son | February 14, 1999 | |
| 22 | Biogenesis | May 16, 1999 | |
| Season 7 | |||
| 1 | The Sixth Extinction | November 7, 1999 | |
| 2 | The Sixth Extinction II: Amor Fati | November 14, 1999 | |
| 10 | Sein Und Zeit | February 6, 2000 | |
| 11 | Closure | February 13, 2000 | DVD only |
| 15 | En Ami | March 19, 2000 | |
| 22 | Requiem | May 21, 2000 | DVD only |
| Season 8 | |||
| 1 | Within | November 5, 2000 | |
| 2 | Without | November 12, 2000 | |
| 11 | The Gift | February 4, 2001 | Book only |
| 13 | Per Manum | February 18, 2001 | |
| 14 | This Is Not Happening | February 25, 2001 | |
| 15 | DeadAlive | April 1, 2001 | |
| 16 | Three Words | April 8, 2001 | |
| 18 | Vienen | April 29, 2001 | |
| 20 | Essence | May 13, 2001 | |
| 21 | Existence | May 20, 2001 | |
| Season 9 | |||
| 1 | Nothing Important Happened Today | November 11, 2001 | |
| 2 | Nothing Important Happened Today II | November 18, 2001 | |
| 6 | Trust No 1 | January 6, 2002 | |
| 9 | Provenance | March 3, 2002 | |