• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Mitch Pileggi (Assistant Director Walter Skinner), Mike Gomez (Jorge Concepcion)
• And: Raymond J. Barry (Senator Richard Matheson)
• Co-Starring: William B. Davis (Smoking Man), Les Carlson (Dr. Troisky), Marcus Turner (Young Mulder), Vanessa Morley (Samantha), Fulvio Cecere (Aide)
• Featuring: Deryl Hayes (Agent Morris), Dwight McFee (Commander), Lisa Anne Beley (Student), Gary Hetherington (Lewin), Bob Wilde (Rand)
• Written By: Glen Morgan & James Wong
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Mitch Pileggi (Assistant Director Walter Skinner), Darin Morgan (Flukeman)
• Co-Starring: Matthew Bennet (First Workman), Freddy Andreiuci (Detective Norman), Don MacKay (Charlie), Marc Bauer (Agent Brisentine), Gabrielle Rose (Dr. Zenzola), Ron Sauve (Foreman), Dmitri Boudrine (Russian Engineer), Raoul Ganee (Dmitri), William Macdonald (Federal Marshall)
• Written By: Chris Carter
• Directed By: Daniel Sackheim

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: William Sanderson (Edward Funsch), John Cygan (Sheriff Spencer), Kimberly Ashlyn Gere (Mrs. McRoberts), George Touliatos (Larry Winter)
• Co-Starring: Bruce Harwood (Byers), Dean Haglund (Langly), Tom Braidwood (Frohike), Gerry Rosseau (Mechanic), Andre Daniels (Harry)
• Featuring: William MacKenzie (Bus Driver), Diana Stevan (Mrs. Adams), David Fredericks (Security Guard), Kathleen Duborg (Mother), John Harris (Taber), B.J. Harrison (Clerk)
• Teleplay By: Glen Morgan & James Wong
• Story By: Darin Morgan
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Mitch Pileggi (Assistant Director Walter Skinner), Nicholas Lea (Agent Alex Krycek), Jonathan Gries (Sal Matola), Steven Williams (X)
• And: Tony Todd (Augustus Cole)
• Co-Starring: Don Thompson (Henry Willig), David Adams (Dr. Girardi), Michael Puttonen (Dr. Pilsson), Anna Hagan (Dr. Charyn), William B. Davis (Smoking Man), Mitch Kosterman (Detective Morton), Paul Bittante (Team Leader), Claude De Martino (Dr. Grissom)
• Written By: Howard Gordon
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Steve Railsback (Duane Barry), Nicholas Lea (Agent Alex Krycek)
• And: C.C.H. Pounder (Agent Kazdin)
• Co-Starring: Stephen E. Miller (Tactical Officer), Frank C. Turner (Dr. Hakkie), Fred Henderson (Agent Rich), Barbara Pollard (Gwen), Sarah Strange (Kimberly)
• Featuring: Robert Lewis (Officer), Michael Dobson (Marksman #2), Tosca Baggoo (Clerk), Tim Dixon (Bob), Prince Maryland (Agent Janus), John Sampson (Marksman #1)
• Written By: Chris Carter
• Directed By: Chris Carter

• Tagline: DENY EVERYTHING
• Guest Starring: Steve Railsback (Duane Barry), Mitch Pileggi (Assistant Director Walter Skinner), Nicholas Lea (Agent Alex Krycek), Sheila Larken (Margaret Scully)
• And: Steven Williams (X)
• Co-Starring: Meredith Bain Woodward (Dr. Ruth Slaughter), William B. Davis (Smoking Man), Michael David Simms (FBI Agent), Peter Lacroix (Dwight), Steve Makaj (Patrolman), Peter Lapres (Video Technician), Bobby L. Stewart (Deputy)
• Written By: Paul Brown
• Directed By: Michael Lange

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Justina Vail (The Unholy Spirit), Perrey Reeves (Kristen Kilar)
• And: Frank Military (The Son / John)
• Co-Starring: Tom McBeath (Detective Gwynn), Malcolm Stewart (Commander Carver), Frank Ferrucci (Detective Nettles), Ken Kramer (Dr. Browning), Roger Allford (Garrett Lorre)
• Featuring: Richard Yee (David Yung), Brad Loree (Fireman), Gustavo Moreno (Father), John Tierney (Dr. Jacobs), David Livingstone (Guard)
• Written By: Chris Ruppenthal & Glen Morgan & James Wong
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Sheila Larken (Margaret Scully), Melinda McGraw (Melissa Scully), Mitch Pileggi (Assistant Director Walter Skinner), Steven Williams (X), William B. Davis (Cigarette-Smoking Man), Don Davis (Captain William Scully)
• Co-Starring: Jay Brazeau (Dr. Daly), Nicola Cavendish (Nurse Owens), Lorena Gale (Nurse Wilkins)
• Featuring: Bruce Harwood (Byers), Dean Haglund (Langly), Tom Braidwood (Frohike), Ryan Michael (Overcoat Man), Tegan Moss (Young Dana Scully)
• Written By: Glen Morgan & James Wong
• Directed By: R.W. Goodwin

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Bradley Whitford (Dr. Daniel Trepkos), Leland Orser (Jason Ludwig), Shawnee Smith (Jesse O'Neil), Tuck Milligan (Dr. Adam Pierce)
• Co-Starring: Hiro Kanagawa (Tanaka), David Kaye (Reporter), David Lewis (Vosberg), Torben Rolfsen (Technician)
• Written By: Howard Gordon
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Paul Sand (Gerd Thomas), Steve Eastin (Sheriff Mazeroski), Mark Rolston (Richard Odin), Lindsey Ginter (Crew-Cut Man)
• Co-Starring: Gillian Barber (Beth Kane), Bob Frazer (Gary Kane), Robert Clothier (Old Man), Elisabeth Rosen (Katie)
• Featuring: Crystal Verge (Woman Reading Words), Cameron Labine (Rick), Tony Sampson (Brad), Gerry Nairn (1st Man), Brian McGugan (1st Officer)
• Written By: Chris Carter
• Directed By: Win Phelps

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Teryl Rothery (Nurse Michelle Charters), Sab Shimono (Gung Bittuen), Frances Bay (Dorothy), Eric Christmas (Stan Phillips), David Fresco (Hal Arden)
• Co-Starring: Sheila Moore (Mrs. Dawson), Jerry Wasserman (Dr. Grago), Tasha Simms (Laura), Jon Cuthbert (Tiernan), Paul Jarrett (Upshaw), Ernie Prentice (Leo)
• Written By: Paul Brown
• Directed By: Stephen Surjik

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Terry O'Quinn (Lieutenant Brian Tillman), Deborah Strang (Detective B.J. Morrow), Morgan Woodward (Old Harry Cokely), Joy Coghill (Mrs. Ruby Thibedeaux)
• Co-Starring: Robyn Driscoll (Detective Joe Darnell), Peter Fleming (Officer #1), Sarah Jane Redmond (Young Mom), Emanuel Hajek (Young Cokely)
• Written By: Sara B. Charno
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Bruce Weitz (Agent Moe Bocks), Nick Chinlund (Donald Pfaster)
• Co-Starring: Deanna Milligan (Satin), Robert Thurston (Toews), Glynis Davies (Ellen), Christine Willes (Karen Kosseff), Tim Progosh (Mr. Fiebling)
• Featuring: Dwight McFee (Suspect), Denalda Williams (Marilyn), Maggie O'Hara (Young Woman), Kathleen Duborg (Prostitute), Mark Saunders (Agent Busch), Ciara Hunter (Coed)
• Written By: Chris Carter
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Dan Butler (Jim Ausbury), Susan Blommaert (Phyllis H. Paddock), Heather McComb (Shannon Ausbury)
• Co-Starring: Shawn Johnston (Pete Calcagni), P. Lynn Johnson (Deborah Brown), Travis MacDonald (Dave Duran)
• Featuring: Michele Goodger (Barbara Ausbury), Larry Musser (Sheriff John Oakes), Franky Czinege (Jerry Thomas), Laura Harris (Andrea), Doug Abrahams (Paul Vitaris)
• Written By: Glen Morgan & James Wong
• Directed By: Kim Manners

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Bruce Young (Pierre Bauvais), Daniel Benzali (Colonel Wharton), Jamil Walker Smith (Chester Bonaparte), Matt Hill (Private Harry Dunham), Callum Keith Rennie (Groundskeeper)
• And: Steven Williams (X)
• Co-Starring: Kevin Conway (Private Jack McAlpin), Katya Gardner (Robin), Roger Cross (Private Kittel), Peter Kelamis (Lieutenant Foyle)
• Written By: Howard Gordon
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Peter Donat (William Mulder), Brian Thompson (Bounty Hunter), Dana Gladstone (Dr. Landon Prince / Gregor), Megan Leitch (Samantha Mulder), Tom Butler (CIA Agent Ambrose Chapel)
• And: Mitch Pileggi (Assistant Director Walter Skinner)
• Co-Starring: Tim Henry (Federal Marshal), Andrew Johnston (Agent Weiss), Rebecca Toolan (Mrs. Mulder), Ken Roberts (Proprietor), Michael Rogers (1st Crewman), Oliver Becker (2nd Doctor)
• Featuring: James Leard (Sergeant Al Dixon), Linden Banks (Reverend Sistrunk), Bonnie Hay (Field Doctor), Kim Restell (Newspaper Clerk), Richard Sargent (Captain), David L. Gordon (FBI Agent)
• Teleplay By: Chris Carter
• Story By: David Duchovny & Chris Carter
• Directed By: Nick Marck

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Steven Williams (X), Peter Donat (William Mulder), Brian Thompson (Bounty Hunter), Megan Leitch (Samantha Mulder), Colin Cunningham (Lieutenant Terry Wilmer)
• And: Mitch Pileggi (Assistant Director Walter Skinner)
• Co-Starring: Garry Davey (Captain), Andrew Johnston (Agent Weiss), Allan Lysell (Able Gardner)
• Featuring: J.B. Bivens (Sharpshooter), Oliver Becker (2nd Doctor), Beatrice Zeilinger (Paramedic), Bonnie Hay (Field Doctor)
• Written By: Frank Spotnitz
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jayne Atkinson (Willa Ambrose), Lance Guest (Kyle Lang), Jack Rader (Ed Meecham)
• Co-Starring: Bruce Harwood (Byers), Tom Braidwood (Frohike), Jody St. Michael (Sophie)
• Featuring: Charles Andre (Ray Floyd), Garvin Cross (Red Head Kid), Tom Glass (Trucker)
• Written By: Steve De Jarnatt
• Directed By: James Whitmore, Jr.

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: John Savage (Henry Trondheim), David Cubitt (Captain Barclay), Vladimir Kulich (Olafsson)
• Co-Starring: Stephen Dimopolous (Ionesco), Claire Riley (Dr. Laskos), Robert Metcalfe (Nurse), Dmitry Chepovetsky (Lieutenant Harper)
• Teleplay By: Howard Gordon & Alex Gansa
• Story By: Howard Gordon
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jim Rose (Dr. Blockhead), Wayne Grace (Sheriff Hamilton), Michael Anderson (Mr. Nutt), The Enigma (The Conundrum)
• And: Vincent Schiavelli (Lanny)
• Co-Starring: Alex Diakun (Curator), John Payne (Jerald Glazebrook), Gordon Tipple (Hepcat Helm), Alvin Law (Reverend)
• Written By: Darin Morgan
• Directed By: Kim Manners

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Helene Clarkson (Maggie Holvey), Joel Palmer (Charlie / Michael Holvey), Lilyan Chauvin (Golda), Kay E. Kuter (Head Calusari)
• Co-Starring: Ric Reid (Steve Holvey), Christine Willes (Karen Kosseff), Bill Dow (Chuck Burk)
• Featuring: Jacqueline Dandeneau (Nurse Castor), Bill Croft (Calusari #2), Campbell Lane (Calusari #3), George Josef (Calusari #4)
• Written By: Sara B. Charno
• Directed By: Michael Vejar

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Charles Martin Smith (Dr. Osbourne), Dean Norris (U.S. Marshal Tapia), John Pyper-Ferguson (Paul), William B. Davis (Cigarette-Smoking Man), Angelo Vacco (Angelo Garza)
• And: Mitch Pileggi (Assistant Director Walter Skinner)
• Co-Starring: Morris Panych (Dr. Simon Auerbach), Lynda Boyd (Elizabeth), John Tench (Steve), Alvin Sanders (Bus Driver)
• Featuring: Kim Kondrashoff (Bobby Torrence), Chilton Crane (Mother at Bus Station), Bill Rowat (Dr. Torrence), Jude Zachary (Winston)
• Written By: Chris Carter & Howard Gordon
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Tony Shalhoub (Dr. Chester Banton), Kate Twa (Detective Kelly Ryan), Kevin McNulty (Dr. Christopher Davey)
• And: Steven Williams (X)
• Co-Starring: Nathaniel Deveaux (Detective Barron), Robert Rozen (Doctor), Donna Yamamoto (Night Nurse)
• Featuring: Forbes Angus (Government Scientist), Guyle Fraizer (Officer #1), Steve Bacic (Officer #2), Craig Brunanski (Security Guard)
• Written By: Vince Gilligan
• Directed By: James Contner

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Caroline Kava (Doris Kearns), John Milford (Walter Chaco), Gary Grubbs (Sheriff Tom Arens), Timothy Webber (Jess Harold)
• Co-Starring: John MacLaren (George Kearns), Robin Mossley (Dr. Vance Randolph), Gabrielle Miller (Paula)
• Featuring: Hrothgar Matthews (Mental Patient), Robert Moloney (Worker), Carrie Cain Sparks (Maid)
• Written By: Frank Spotnitz
• Directed By: Rob Bowman

• Tagline: ÉÍ 'AANÍÍGÓÓ 'ÁHOOT'É (Navajo -- The Truth Is Far Away From Here)
• Guest Starring: Peter Donat (William Mulder), Floyd "Red Crow" Westerman (Albert Hosteen), Nicholas Lea (Agent Alex Krycek), William B. Davis (Cigarette-Smoking Man)
• And: Mitch Pileggi (Assistant Director Walter Skinner)
• Co-Starring: Michael David Simms (Senior FBI Agent), Renae Morriseau (Josephine Doane), Ken Camroux (2nd Senior Agent), Dakota House (Eric), Bernie Coulson (The Thinker)
• Featuring: Bruce Harwood (Byers), Dean Haglund (Langly), Tom Braidwood (Frohike), Mitchell Davies (Stealth Man), Paul McLean (Agent Kautz)
• Teleplay By: Chris Carter
• Story By: David Duchovny & Chris Carter
• Directed By: R.W. Goodwin

• Tagline:
• Narrated By: Richard Courtney
• Written By: Ron Scalera & Bart Montgomery
• Directed By: