David Duchovny FBI Special Agent Fox Mulder Actor Gillian Anderson FBI Special Agent Dana Scully Actor Steve Railsback Duane Barry Guest Star Nicholas Lea Alex Krycek Guest Star Mitch Pileggi Asst. Dir. Walter Skinner Guest Star Steven Williams Mr. X Guest Star Sheila Larken Margaret Scully Guest Star Meredith Bain Woodward Dr. Ruth Slaughter Guest Star William B. Davis Smoking Man Guest Star Michael David Simms FBI Agent Guest Star Peter LaCroix Dwight Guest Star Steve Makaj Patrolman Guest Star Peter Lapres Video Technician Guest Star Bobby Stewart Deputy Guest Star Paul Brown Writer Michael Lange Director