Gillian Anderson FBI Special Agent Dana Scully Actor Robert Patrick John Doggett Actor Annabeth Gish Monica Reyes Actor Mitch Pileggi Asst. Dir. Walter Skinner Actor James Pickens Jr. Alvin Kersh Actor Chris Owens Daniel Miller, Jeffrey Spender Guest Star William B. Davis Smoking Man Guest Star Lucy Lawless Shannon McMahon Guest Star Cary Elwes Brad Follmer Guest Star Tom Braidwood Melvin Frohike Guest Star Laurie Holden Marita Covarrubias Guest Star Dean Haglund Richard "Ringo" Langly Guest Star Matthew Glave Special Agent Kallenbrunner Guest Star Bruce Harwood John Fitzgerald Byers Guest Star Neal McDonough Robert Comer Guest Star Sheila Larken Margaret Scully Guest Star Steven Williams Mr. X Guest Star Denis Forest Lone Man Guest Star Alan Dale Toothpick Man Guest Star Travis Riker Baby William Guest Star Chris Carter Executive Producer, Writer, Director Kim Manners Director Tony Wharmby Director David Duchovny Director, Writer Michelle MacLaren Director John Shiban Director, Writer Dwight H. Little Director Vince Gilligan Director, Writer Frank Spotnitz Director, Writer Cliff Bole Director David Amann Writer Steven Maeda Writer Thomas Schnauz Writer