The X-Files/One Son (2)
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One Son (2) is the twelfth episode of the sixth season of The X-Files, and the one hundred twenty-ninth episode overall.
Guest Stars: William B. Davis (Cigarette Smoking Man), Chris Owens (Special Agent Jeffrey Spender), Nicholas Lea (Alex Krycek), Mitch Pileggi (Assistant Director Walter Skinner), Mimi Rogers (Agent Diana Fowley), Veronica Cartwright (Cassandra Spender), Laurie Holden (Marita Covarrubias), Tom Braidwood (Frohike), Dean Haglund (Langly), Bruce Harwood (Byers), Don S. Williams (1st Elder), Al Ruscio (3rd Elder), Frank Ertl (4th Elder), James Pickens, Jr. (Assistant Director Kersh), Peter Donat (William Mulder)