The X-Files

The X-Files was a science fiction television series on Earth, about FBI agents who investigated alien and paranormal events.

In 1999, Brigadier Lethbridge-Stewart called his group of investigators "UNIT's X-Files." The Fifth Doctor was unfamiliar with the programme. (PROSE: The King of Terror)

An older version of Peri Brown living in Los Angeles in 2009 once falsely posed as a secret agent to her younger self, claiming to work for an agency known as "the X-Files." When she tried the ruse on the Fifth Doctor, with whom her younger self was travelling, the Doctor replied that while he had enjoyed the programme, it was never as good after David Duchovny left. (AUDIO: Peri and the Piscon Paradox)

Ace's younger brother Liam McShane was a fan of the series. (AUDIO: The Rapture)

Among a long list of actions the Xlanthi considered to be a violation of the law and punishable by a brutal death was "fancying Scully out of The X-Files." (PROSE: Beige Planet Mars)

Sarah Jane Smith once asked Mike Yates, who had invited her to investigate a haunted house, why he didn't call "Fox and Dana" instead. (PROSE: Housewarming)

Clive Finch had an X-Files mug. (PROSE: Rose)

Eugene Jones had an The X Files VHS in his bedroom. (TV: Random Shoes)

PC Andy Davidson sarcastically referred to Jack Harkness and Gwen Cooper as "Mulder and Scully." (TV: End of Days)

In an alternate timeline, Lizzie Corrigan told Maxwell Edison that her Psychic Investigation Group (PIG) colleagues were fans of the series. (AUDIO: The Eternal Summer)

When Alan Jackson spoke to Maria Jackson about aliens in 2008, he told her that he was new to "all this X-Files stuff". (TV: The Lost Boy)

When Ocean Waters and Melvin Minton were looking for aliens in 2010, Clyde Langer called them "Mulder and Scully." (TV: The Vault of Secrets)

In 2016, Izzy Sinclair bought Maxwell Edison the complete X-Files on Blu-ray for his 60th birthday. She later knocked out Josiah W. Dogbolter with the Blu-ray box set. (COMIC: The Stockbridge Showdown)

Panda called the Forge a group of "cut price Mulder and Scullys". (PROSE: Project: Wildthyme)

Behind the scenes

 * During the 2001 DVD commentary for Spearhead from Space, Nicholas Courtney was amused by the fact that visible on a shelf behind the Brigadier's desk was a file labelled "X" — in other words, "the X file."
 * Gary Russell has cited The X-Files as a major source of inspiration for the novel The Scales of Injustice. The novel's Pale Man echoes the programme's Cigarette Smoking Man. Even the Pale Man's subordinate, The blond man, is based on the Crew Cut Man, Cigarette Smoking Man's subordinate.
 * A number of Doctor Who actors appeared in the series, including Mark Sheppard, Deep Roy, Gordon Tipple, Will Sasso, Catherine Lough, Bill Croft and Michael David Simms. Paul Frift worked on both series 8 of Doctor Who (as producer) and The X-Files: Fight the Future (as unit production manager).