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 William B. Davis Smoking Man Guest Star Nicholas Lea Alex Krycek Guest Star Laurie Holden Marita Covarrubias Guest Star Matthew Glave Special Agent Kallenbrunner Guest Star Jeff Gulka Gibson Praise Guest Star Chris Owens Jeffrey Spender Guest Star Steven Williams Mr. X Guest Star Tom Braidwood Melvin Frohike Guest Star Dean Haglund Richard "Ringo" Langly Guest Star Chris Carter Executive Producer, Writer Kim Manners Director