• Tagline: None
• Guest Starring: Charles Cioffi (Section Chief Scott Blevins), Cliff DeYoung (Doctor Jay Nemman), Sarah Koskoff (Theresa Nemman), Leon Russom (Detective Miles)
• Co-Starring: Zachary Ansley (Billy Miles), Stephen E. Miller (Coroner Truitt), Malcolm Stewart (Dr. Glass), Alexandra Berlin (Orderly), Jim Jansen (Dr. Heitz Werber)
• Featuring: Ken Camroux (Third Man), Doug Abrams (Patrolman #1), William B. Davis (Smoking Man), Katya Gardener (Peggy O'Dell), Ric Reid (Assistant Coroner), Lesley Ewen (Receptionist), J.B. Bivens (Truck Driver)
• Written By: Chris Carter
• Directed By: Robert Mandel

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jerry Hardin (Deep Throat), Michael Bryan French (Paul Mossinger), Seth Green (Emil), Gabrielle Rose (Anita Budahas), Monica Parker (Ladonna)
• Co-Starring: Sheila Moore (Verla McLennen), Lalainia Lindbjerg (Zoe), Andrew Johnston (Lieutenant Colonel Budahas)
• Featuring: Jon Cuthbert (Commanding Officer), Vince Metcalfe (Kissel), Michael Puttonen (Motel Manager), Brian Furlong (Lead Officer), Doc Harris (Mr. McLennen)
• Written By: Chris Carter
• Directed By: Daniel Sackheim

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Doug Hutchison (Eugene Victor Tooms), Donal Logue (Agent Tom Colton), Henry Beckman (Detective Frank Briggs)
• Co-Starring: Kevin McNulty (Fuller), Terence Kelly (Usher), Colleen Winton (Examiner)
• Featuring: James Bell (Detective Johnson), Gary Hetherington (Kennedy), Rob Morton (Kramer), Paul Joyce (Mr. Werner)
• Written By: Glen Morgan & James Wong
• Directed By: Harry Longstreet

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Carrie Snodgress (Darlene Morris), Michael Cavanaugh (Sioux City Sheriff), Don Gibb (Kip), Joel Palmer (Kevin Morris)
• And: Charles Cioffi (Section Chief Scott Blevins)
• Co-Starring: Shelley Owens (Tessa), Don Thompson (Holtzman), Akiko Morison (Leza Atsumi), Taunya Dee (Ruby)
• Featuring: Anthony Harrison (Fourth Man), Glen Roald (M.E. Worker), Mauricio Mercado (Coroner)
• Written By: Alex Gansa & Howard Gordon
• Directed By: Daniel Sackheim

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Claire Stansfield (The Jersey Devil), Wayne Tippit (Detective Thompson), Gregory Sierra (Dr. Diamond), Michael MacRae (Ranger Peter Brullet)
• Co-Starring: Jill Teed (Glenna), Tamsin Kelsey (Ellen), Andrew Airlie (Rod), Bill Dow (Dad), Hrothgar Mathews (Jack)
• Featuring: Jayme Knox (Mom), Scott Swanson (First Officer), Sean O'Byrne (Second Officer), David Lewis (Young Officer), D. Neil Mark (S.W.A.T. Team Officer)
• Written By: Chris Carter
• Directed By: Joe Napolitano

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Barry Primus (Robert Dorland), Lisa Waltz (Lauren Kyte)
• Co-Starring: Lorena Gale (Ellen Bledsoe), Veena Sood (Ms. Saunders), Deryl Hayes (Webster), Kelli Fox (Pathologist), Tom Pickett (Cop), Tom Heaton (Groundskeeper), Janie Woods-Morris (Ms. Lange), Nora McLellan (Jane Morris), Anna Ferguson (Ms. Winn)
• Written By: Glen Morgan & James Wong
• Directed By: Michael Katleman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jerry Hardin (Deep Throat), Rob LaBelle (Steven Wilczek), Wayne Duvall (Agent Jerry Lamana), Blu Mankuma (Claude Peterson)
• Featuring: Tom Butler (Drake), Gillian Barber (Jane Spiller), Marc Baur (Man in Suit), Bill Finck (Sandwich Man), Theodore Thomas (Clyde)
• Written By: Alex Gansa & Howard Gordon
• Directed By: Jerrold Freedman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Xander Berkeley (Dr. Hodge), Felicity Huffman (Dr. Nancy Da Silva), Steve Hytner (Dr. Denny Murphy), Jeff Kober (Bear)
• Co-Starring: Ken Kirzinger (Richter), Sonny Surwiec (Campbell)
• Written By: Glen Morgan & James Wong
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Ed Lauter (Lieutenant Colonel Marcus Aurelius Belt), Susanna Thompson (Michelle Generoo)
• Co-Starring: Tom McBeath (Scientist), Terry David Mulligan (Mission Controller), French Tickner (Preacher), Norma Wick (Reporter)
• Featuring: Alf Humpheys (2nd Controller), David Cameron (Young Scientist), Tyronne L'Hirondelle (Databank Scientist), Paul DesRoches (Paramedic)
• Written By: Chris Carter
• Directed By: William Graham

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Frederick Coffin (Section Chief Joseph McGrath), Marshall Bell (Commander Calvin Henderson), Scott Bellis (Max Fenig)
• And: Jerry Hardin (Deep Throat)
• Co-Starring: Brent Stait (Corporal Taylor), Alvin Sanders (Deputy Sheriff J. Wright), Sheila Paterson (Gina Watkins), Tony Pantages (Lieutenant Fraser), Freda Perry (Mrs. Wright), Michael Rogers (Lieutenant Griffin), William McDonald (Dr. Oppenheim), Jane MacDougall (Laura Dalton), Kimberly Unger (Karen Koretz)
• Written By: Howard Gordon & Alex Gansa
• Directed By: Larry Shaw

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Harriet Harris (Dr. Sally Kendrick / Eve 6,7,8), Erika Krievins (Cindy Reardon), Sabrina Krievins (Teena Simmons)
• And: Jerry Hardin (Deep Throat)
• Co-Starring: George Touliatos (Dr. Katz), Tasha Simms (Ellen Reardon), Janet Hodgkinson (Waitress), David Kirby (Ted Watkins), Tina Gilbertson (Donna Watkins), Christine Upright-Letain (Ms. Wells)
• Featuring: Gordon Tipple (Detective), Garry Davey (Hunter), Joe Maffei (Guard #1), Maria Herrera (Guard #2), Robert Lewis (Officer)
• Written By: Kenneth Biller & Chris Brancato
• Directed By: Fred Gerber

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Amanda Pays (Inspector Phoebe Green), Mark Sheppard (Bob / Cecil L'ively), Dan Lett (Sir Malcolm Marsden), Laurie Paton (Lady Marsden)
• Co-Starring: Duncan Fraser (Beatty), Phil Hayes (Driver #1), Keegan Macintosh (Michael)
• Featuring: Lynda Boyd (Woman in Bar), Christopher Gray (Jimmie), Alan Robertson (Grey-haired Man)
• Written By: Chris Carter
• Directed By: Larry Shaw

• Tagline: THE TRUTH IS OUT THERE
• Special Guest Star: Brad Dourif (Luther Lee Boggs)
• Guest Starring: Don Davis (Captain William Scully), Sheila Larken (Margaret Scully)
• Co-Starring: Lawrence King (Lucas Henry), Fred Henderson (Agent Thomas), Don Mackay (Warden Joseph Cash), Lisa Vultaggio (Liz Hawley)
• Featuring: Chad Willett (Jim Summers), Kathrynn Chisholm (Nurse), Randy Lee (Paramedic), Len Rose (E.R. Doctor)
• Written By: Glen Morgan & James Wong
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Brent Hinkley (Brother Andrew), Michele Goodger (Sister Abigail)
• Co-Starring: Peter Stebbings (Marty - Male), Kate Twa (Marty - Female), Nicholas Lea (Michel), Mitchell Kosterman (Detective), Paul Batten (Brother Wilson), Doug Abrahams (Agent #2)
• Featuring: Aundrea MacDonald (Pretty Woman), John R. Taylor (Husband), Grai Carrington (Tall Man), Tony Morelli (Cop), Lesley Ewen (Agent #1), David Thomson (Brother Oakley)
• Written By: Larry Barber & Paul Barber
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Christopher Allport (Agent Jack Willis), Cec Verrell (Lula Phillips), Jackson Davies (Agent Bruskin)
• Co-Starring: Jason Schombing (Warren James Dupre), Callum Keith Rennie (Tommy), Jay Brazeau (Professor Varnes), Lisa Bunting (Doctor #1)
• Featuring: Peter Kelamis (O'Dell), Brenda Crichlow (Reporter), Mark Saunders (Doctor #2), Alexander Boynton (Clean Cut Man), Russell Hamilton (Officer Daniels)
• Written By: Alex Gansa & Howard Gordon
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Dick Anthony Williams (Agent Reggie Purdue), Alan Boyce (Young John Barnett), Christine Estabrook (Agent Henderson), Graham Jarvis (NIH Doctor)
• And: Jerry Hardin (Deep Throat)
• Co-Starring: Robin Mossley (Dr. Ridley), Merrilyn Gann (Prosecuting Attorney), Gordon Tipple (Joe Crandall), William B. Davis (CIA Agent)
• Featuring: Courtney Arciaga (Young Child), David Petersen (Older Barnett), Robin Douglas (Computer Tekkie)
• Written By: Scott Kaufer & Chris Carter
• Directed By: Michael Lange

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jerry Hardin (Deep Throat)
• Co-Starring: Allan Lysell (Chief Rivers), Peter LaCroix (Ranheim / Frank Druse), Bruce Harwood (Byers), Dean Haglund (Langly), Tom Braidwood (Frohike)
• Written By: Glen Morgan & James Wong
• Directed By: William Graham

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: R.D. Call (Sheriff Maurice Daniels), Scott Bairstow (Samuel Hartley), George Gerdes (Reverend Calvin Hartley), Dennis Lipscomb (Leonard Vance)
• Co-Starring: Walter Marsh (Judge), Campbell Lane (Hohman's Father), Chilton Crane (Margaret Hohman), Howard Storey (Fire Chief), Iris Quinn Bernard (Lillian Daniels), Lisa Ann Beley (Beatrice Salinger), Alex Doduk (Young Samuel), Roger Haskett (Deputy Tyson)
• Written By: Howard Gordon & Chris Carter
• Directed By: Michael Lange

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Ty Miller (Lyle Parker), Michael Horse (Sheriff Charles Tskany), Donnelly Rhodes (Jim Parker), Jimmy Herman (Ish), Renae Morriseau (Gwen Goodensnake)
• Co-Starring: Dwight McFee (David Gates), Paul McLean (Dr. Josephs)
• Written By: Marilyn Osborn
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jason Beghe (Larry Moore), Tom O'Rourke (Steve Humphreys), Titus Welliver (Doug Spinney)
• Co-Starring: David Hay (Clean Suited Man), Barry Greene (Perkins), Ken Tremblett (Dyer)
• Written By: Chris Carter
• Directed By: Joe Napolitano

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Doug Hutchison (Eugene Victor Tooms), Paul Ben Victor (Dr. Aaron Monte), Mitch Pileggi (Assistant Director Walter S. Skinner), Henry Beckman (Detective Frank Briggs)
• Co-Starring: Timothy Webber (Detective Talbot), Jan D'Arcy (Judge Kann), Jerry Wasserman (Doctor Plith)
• Featuring: Frank C. Turner (Doctor Collins), Gillian Carfra (Christine Ranford), Pat Bermel (Frank Ranford), Mikal Dughi (Dr. Karetzky), Glynis Davies (Nelson), Steve Adams (Myers), Catherine Lough (Dr. Richmond), William B. Davis (Smoking Man), Andre Daniels (Arlan Green)
• Written By: Glen Morgan & James Wong
• Directed By: David Nutter

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Brian Markinson (Tony Fiore), Mimi Lieber (Anita Fiore), Maggie Wheeler (Detective Sharon Lazard), Dey Young (Judy Bishop), Andrea Libman (Michelle Bishop)
• Co-Starring: P. Lynn Johnson (Dr. Sheila Braun), Leslie Carlson (Dr. Spitz), Richard Sali (Felder), Dwight Koss (Detective Barbala), Peter Lapres (Harry Linhart)
• Written By: Howard Gordon & Alex Gansa
• Directed By: Jerrold Freedman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Zeljko Ivanek (Roland Fuller), Micole Mercurio (Mrs. Stodie), Kerry Sandomirsky (Tracy), Garry Davey (Dr. Keats), James Sloyan (Dr. Frank Nollette)
• Co-Starring: Matthew Walker (Surnow), Dave Hurtubise (Barrington), Sue Mathew (Lisa Dole)
• Written By: Chris Ruppenthal
• Directed By: David Nutter

• Tagline: TRUST NO ONE
• Guest Starring: Lindsey Ginter (Crew-Cut Man), Anne DeSalvo (Dr. Anne Carpenter), Simon Webb (Dr. William Secare)
• And: Jerry Hardin (Deep Throat)
• Co-Starring: Jim Leard (Captain Lacerio), Ken Kramer (Dr. Berube), Phillip MacKenzie (Medic)
• Featuring: William B. Davis (Smoking Man), Jaylene Hamilton (Reporter), Mike Mitchell (1st Uniformed Cop), John Payne (Guard)
• Written By: Chris Carter
• Directed By: R.W. Goodwin