X (The X-Files)

X (The X-Files)

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 début in the second season episode "The Host", although the character would not appear on-screen until "Sleepless", two episodes later. The role had original 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 to the character's predecessor, Deep Throat, and has been positively received by critics and fans.

Read more about X (The X-Files):  Conceptual History, Character Arc, Reception

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X (The X-Files) - Reception
... If Deep Throat was a cheat code to the quest for truth, X is an walkthrough written by somebody who doesn't want to share his secrets, doesn't like you, and might not even be playing the same game ... —A.V ...