David Duchovny as Fox Mulder
Gillian Anderson as Dana Scully
Mitch Pileggi as Walter Skinner
William B. Davis as Cigarette Smoking Man
Robert Patrick as John Doggett
Annabeth Gish as Monica Reyes
Dean Haglund as Richard "Ringo" Langly
Bruce Harwood as John Byers
Tom Braidwood as Melvin Frohike
Nicholas Lea as Alex Krycek
James Pickens Jr. as Alvin Kursh
Cary Elwes as FBI Assistant Director Brad Follmer
Steven Williams as Mr. X
Jerry Hardin as Deep Throat
Laurie Holden as Marita Covarrubias
Lauren Ambrose as Agent Einstein
Robbie Amell as Agent Miller