Patient X (The X-Files)

"Patient X"
The X-Files episode
Dmitri, a young Kazakh, is infected by the black oil.
Episode no.	Season 5 Episode 13
Directed by	Kim Manners
Written by	Chris Carter Frank Spotnitz
Production code	5X13
Original air date	March 1, 1998
Running time	45 minutes
Guest appearance(s)
Nicholas Lea as Alex Krycek Laurie Holden as Marita Covarrubias Don S. Williams as First Elder John Moore as Third Elder Brian Thompson as Bounty Hunter John Neville as Well-Manicured Man Chris Owens as Jeffrey Spender Veronica Cartwright as Cassandra Spender Willy Ross as Quiet Willy Jim Jansen as Heitz Werber Alex Shostak Jr. as Dmitri Ron Halder as Dr. Floyd Fazio Kurt Max Bunte as Ranger Raoul Ganeev as Guard Max Wyman as Dr. Lagerqvist Barbara Dyke as Dr. Alepin Bruno Verdoni as UN Officer Andrew Star as Dmtri's Friend Anatol Rezmeritsa as Commandant Oleg Feoktistov as Doctor Allen Franz as Man in VW Van
Episode chronology
← Previous "Bad Blood" Next → "The Red and the Black"
List of Season 5 episodes List of The X-Files characters

"Patient X" is the thirteenth episode of the fifth season of American science fiction television series The X-Files. It was written by series creator Chris Carter and Frank Spotnitz, directed by Kim Manners and aired in the United States on March 1, 1998 on the Fox network. The episode earned a Nielsen household rating of 12.6, being watched by 20.21 million people in its initial broadcast. The episode received moderately positive reviews from critics.

The show centers on FBI special agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) who work on cases linked to the paranormal, called X-Files. Mulder is a believer in the paranormal, while the skeptical Scully has been assigned to debunk his work. In this episode, as a rebel alien race secretly attacks several groups of former alien abductees, the agents meet Cassandra Spender (Veronica Cartwright), a woman who claims to be a multiple abductee and wants to deliver a positive message about aliens. Agent Mulder, now skeptical about extraterrestrial activity, is disturbed when Agent Scully forms a special bond with the woman.

"Patient X" was a story milestone for the series. It introduced several new recurring characters for the series. It was the first episode to feature Chris Owens as Jeffrey Spender and Veronica Cartwright as Cassandra Spender. It is the first of a two-part story that concludes with the following episode, "The Red and the Black".