David Duchovny FBI Special Agent Fox Mulder Actor Gillian Anderson FBI Special Agent Dana Scully Actor Dick Anthony Williams Agent Reggie Purdue Guest Star Alan Boyce Young John Barnett Guest Star Christine Estabrook Agent Henderson Guest Star Graham Jarvis NIH Doctor Guest Star Robin Mossley Dr. Joe Ridley Guest Star Merrilyn Gann Prosecuting Attorney Guest Star Gordon Tipple Joe Crandall Guest Star William B. Davis CIA Agent Guest Star Courtney Arciaga Young Child Guest Star David Petersen Older John Barnett Guest Star Robin Douglas Computer Tekkie Guest Star Jerry Hardin Deep Throat Guest Star Scott Kaufer Writer Chris Carter Writer Michael Lange Director