Fun Fact: Although his character in the show is a hardcore believer in the paranormal and extraterrestrial life, Duchovny is actually a skeptic in real life. At the same time, Gillian Anderson, whose character is a skeptic in the show, is actually a believer in real life.

Fun Fact: Gillian Anderson was only 24 years old when she was cast in the show.

Fun Fact: Pileggi worked as a defense contractor in Iran before moving back to the U.S. in 1978 in the midst of the Iranian Revolution.

Fun Fact: The character of Alex Krycek was originally meant to replace Dana Scully for only three episodes, while Anderson was away on maternity leave. The character ended up lasting eight seasons.

Fun Fact:TV Guide named Robert Patrick’s Agent John Doggett as one of the “10 Sexiest Men in Sci-Fi.”

Fun Fact: Annabeth Gish is related to silent film actors Dorothy and Lillian Gish, the latter of whom appeared in the 1915 D.W. Griffith controversial classic Birth of a Nation.

Fun Fact: According to producer Kim Manners, at the start of the show, Davis was only supposed to be an extra leaning against a shelf. He would go on to play the main antagonist of the show.

Fun Fact: The role of “Deep Throat” was originally supposed to appear one time in the first season. However, he became a recurring character throughout the first season, appearing sporadically throughout the series.

Fun Fact: Laurie Holden was 25 years old when she was cast in the role.

Fun Fact: Thompson was cast in The Terminator, along with Bill Paxton, while he was still in high school.

Fun Fact: Today, Jeff Gulka plays organs and piano for his band The Wicks.

Interesting Fact: In the pilot episode of their spin-off series, the Gunmen try to stop a hijacked plane from crashing into the World Trade Center. The episode aired six months before September 11, 2001.