David Duchovny FBI Special Agent Fox Mulder Actor Gillian Anderson FBI Special Agent Dana Scully Actor William B. Davis Smoking Man Guest Star Jerry Schram Larold Rebhun Guest Star Chris Owens Young Cigarette Smoking Man Guest Star Nicholas Lea Alex Krycek Guest Star Mitch Pileggi Asst. Dir. Walter Skinner Guest Star Laurie Holden Marita Covarrubias Guest Star Dean Aylesworth Young Bill Mulder Guest Star John Neville Well-Manicured Man Guest Star Vanessa Morley Samantha Mulder Guest Star Sheila Larken Margaret Scully Guest Star Malcolm Stewart Dr. Sacks Guest Star Greg Michaels Scott Garrett Guest Star Don S. Williams Elder Guest Star Morris Panych Gray Haired Man Guest Star Rebecca Toolan Teena Mulder Guest Star Brendan Beiser Agent Pendrell Guest Star Tom Braidwood Melvin Frohike Guest Star Bruce Harwood John Fitzgerald Byers Guest Star Chris Carter Executive Producer, Writer Howard Gordon Writer Vince Gilligan Writer John Shiban Writer Glen Morgan Writer R.W. Goodwin Writer, Director Valerie Mayhew Writer Rob Bowman Director Frank Spotnitz Writer James Wong Writer, Director James Charleston Director Vince Gillian Writer David Greenwalt Writer Vivian Mayhew Writer Tucker Gates Director Kim Manners Director Michael Lange Director