David Duchovny FBI Special Agent Fox Mulder Actor Gillian Anderson FBI Special Agent Dana Scully Actor Perrey Reeves Kristen Kilar Guest Star Tom McBeath Detective Gwynn Guest Star Frank Ferrucci Inspector Nettles Guest Star Justina Vail The Unholy Spirit Guest Star Gustavo Moreno The Father Guest Star Frank Military The Son, John Guest Star Malcolm Stewart Commander Carver Guest Star Ken Kramer Dr. Browning Guest Star Roger Allford Garrett Lorre Guest Star Richard Yee David Yung Guest Star Brad Loree Fireman Guest Star John Tierney Dr. Jacobs Guest Star David Livingstone Guard Guest Star Chris Ruppenthal Writer Glen Morgan Writer James Wong Writer David Nutter Director