| X | |
|---|---|
| The X-Files character | |
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| First appearance | "The Host" |
| Last appearance | "The Truth" |
| Created by | Chris Carter |
| Portrayed by | Steven Williams Natalija Nogulich (deleted scenes) |
| In-universe information | |
| Gender | Male |
| Occupation | Unknown |
| Affiliated with | Men in Black Federal Bureau of Investigation, The X-Files |
| Duration | 1994–1996, 2002 |
X, sometimes referred to as Mr. X, is a fictional character on the American science fiction television series The X-Files. He serves as an informant, leaking information to FBI Special Agents Fox Mulder and Dana Scully to aid their investigation of paranormal cases, dubbed X-Files. The character serves as a replacement for Deep Throat, who had been killed off in the first season finale, "The Erlenmeyer Flask". X himself would be killed off after appearing in several seasons, eventually being replaced by Marita Covarrubias.
X is portrayed in the series by Steven Williams, and made his debut in the second season episode "The Host", although the character would not appear on-screen until "Sleepless", two episodes later. The role had originally been conceived as female, with Natalija Nogulich cast in the role; however, her initial scenes were deemed unsatisfactory by the producers, leading to her replacement. Williams' portrayal of X was intended to introduce a personality completely different from the character's predecessor, Deep Throat, and was positively received by critics and fans.