The X-Files (1993)

Trivia: Scully's father and the man Mulder thought was his father were both named William. Mulder's actual father, Cancer Man, was played by William B Davis. Scully and Mulder's son was also named William.

Trivia: In 2001, The Lone Gunmen were given their own self-titled TV series, The Lone Gunmen.

Teliko - S4-E3

Trivia: The initial footage of the episode was taken from the movie Airport 1975 (a Columbia Airlines jumbo jet). (00:00:01)

Trivia: Whenever the Cigarette Smoking Man smokes on the show, the actor is smoking herbal cigarettes.

Trivia: Two numbers that appear frequently during the series are 1013 and 1121. October 13 is series creator Chris Carter's birthday, and November 21 is his wife's birthday.

Trivia: The Lone Gunman is a reference to the Kennedy assassination, in which the Warren Commission reported that a lone gunman, Lee Harvey Oswald, killed President John F. Kennedy. Ironically, Bruce Harwood's character, John Byers, is named after Kennedy.

Tithonus - S6-E10

Trivia: If the story in this episode is to be believed, Scully is now completely immortal. Alfred Fellig couldn't die because he had bypassed death - his nurse died in his place. When Scully is all but dead and Fellig grabs death away from her and dies himself, this should leave Scully in the same position as Fellig was before he died - completely immortal.

Trivia: The Cancer Man smokes Morley cigarettes, a fake brand that has appeared in a number of TV shows and movies since the '60s.

Paper Clip (3) - S3-E2

Trivia: Here we can see that Mulder was born on 13 October. Interestingly, creator Chris Carter was also born on 13 October. (00:20:40)

Shadows - S1-E6

Trivia: When Mulder and Scully are in the car park, and Howard Graves's car parking space is being renamed, the name being painted on is Tom Braidwood - who is the actor who plays Frohike and is also an Assistant Director of the series.

Trivia: Series creator Chris Carter changed the name of William B. Davis' character from "Cancer Man" to "Cigarette Smoking Man" about halfway through the series so tobacco companies wouldn't be offended. However, the character was still referred to by both names throughout the series.

Trivia: The "I Want To Believe" poster in Mulder's office was a prop created exclusively for the show and wasn't intended to be made commercially available. However, popular demand caused Fox to release the poster for sale.

Fire - S1-E12

Trivia: David Duchovny (Mulder) got burned while shooting a scene. The scar can be seen when he is at the party shortly before Phoebe arrives and asks if they can dance.

E.B.E. - S1-E17

Trivia: When Mulder and Scully arrive at the government building with the fake IDs, Mulder's ID says he's Tom Braidwood. Tom Braidwood played Melvin Frohike in this episode and many others.

Miracle Man - S1-E18

Trivia: The scar David Duchovny (Mulder) got on his left hand while shooting "Fire" can be seen in the bar scene after the sheriff takes the boy away.

Anasazi (1) - S2-E25

Trivia: Chris Carter makes an uncredited appearance in this episode as an F.B.I. agent who asks Scully if she was assigned to debunk Mulder's work.

Piper Maru (1) - S3-E15

Trivia: This episode is named after Gillian Anderson's daughter, Piper Maru Anderson.

Pilot - S1-E1

Trivia: In the scene on the plane, the man who is sitting behind Scully is David Duchovny's father.

Tooms - S1-E21

Trivia: William B Davis (Cancer Man) spoke his first line in this episode.

Squeeze - S1-E3

Trivia: The shot of Tooms going down the chimney to reach his fourth victim was not done by any visual effects. A contortionist named Pepper actually squeezed inside, and then the sounds of bones cracking and snapping were added later. Confirmed by co-executive producer Robert Goodwin.