Gillian Anderson FBI Special Agent Dana Scully Actor David Duchovny FBI Special Agent Fox Mulder Actor Mitch Pileggi Asst. Dir. Walter Skinner Actor William B. Davis Cigarette Smoking Man Guest Star Miles Robbins William, Jackson Van De Kamp Guest Star Annabeth Gish Monica Reyes Guest Star James Pickens Jr. Alvin Kersh Guest Star Joel McHale Tad O'Malley Guest Star Barbara Hershey Erika Price Guest Star A.C. Peterson Mr. Y Guest Star Sarah Jeffery Brianna Stapleton Guest Star Madeleine Arthur Sarah Arthur Guest Star West Duchovny Maddy Guest Star Chris Carter Executive Producer, Writer, Director Glen Morgan Executive Producer