• Tagline: EVERYTHING DIES
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner), William B. Davis (Cigarette Smoking Man)
• Guest Starring: Roy Thinnes (Jeremiah Smith), Brian Thompson (Bounty Hunter), Steven Williams (X), Laurie Holden (Marita Covarrubius)
• Co-Starring: Morris Panych (Gray Haired Man), Rebecca Toolan (Mrs. Mulder), Brendan Beiser (Agent Pendrell), Garvin Cross (Repairman)
• Featuring: Ken Camroux (2nd Senior Agent), Don S. Williams (Elder), Michael David Simms (Senior Agent)
• Written By: Chris Carter
• Directed By: R.W. Goodwin

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Tucker Smallwood (Sheriff Andy Taylor), Chris Nelson Norris (Edmund Creighton Peacock), Adrian Hughes (Sherman Nathaniel Peacock), John Trottier (George Raymond Peacock), Karin Konoval (Mrs. Peacock), Sebastian Spence (Deputy Barney Paster)
• Featuring: Judith Maxie (Mrs. Barbara Taylor), Kenny James (Radio Singer), Lachlan Murdoch (Right Fielder), Neil Denis (Catcher), Cory Fry (Batter), Douglas Smith (Pitcher)
• Written By: Glen Morgan & James Wong
• Directed By: Kim Manners

• Tagline: DECEIVE INVEIGLE OBFUSCATE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Carl Lumbly (Marcus Duff), Willie Amakye (Samuel Aboah), Laurie Holden (Marita Covarrubius), Brendan Beiser (Agent Pendrell), Zakes Mokae (Minister Diabria)
• Co-Starring: Bob Morrisey (Dr. Bruin)
• Featuring: Danny Wattley (First Officer), Bill Mackenzie (Bus Driver), Michael O'Shea (Lieutenant Madsen)
• Written By: Howard Gordon
• Directed By: James Charleston

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Pruitt Taylor Vince (Garry Thomas Schnauz)
• Co-Starring: Walter Marsh (Druggist)
• Featuring: William MacDonald (Officer Trott), Sharon Alexander (Mary Lefante), Ron Chartier (Inspector Puett), Michael Cram (Officer Corning), Christopher Royal (Photo Technician), Michele Melland (ER Doctor), Scott Heindl (Boyfriend)
• Written By: Vince Gilligan
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Kristen Cloke (Melissa Riedal-Ephesian), Michael Massee (Vernon Ephesian)
• And: Michael Massee (Vernon Ephesian)
• Co-Starring: Anthony Harrison (FBI Agent Riggins)
• Featuring: Doug Abrahams (Harbaugh), Donna White (Therapist), Michael Dobson (BATF Agent)
• Written By: Glen Morgan & James Wong
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Richard Beymer (Dr. Jack Franklyn), O-Lan Jones (Nurse Rebecca Waite), Arlene Mazerolle (Dr. Theresa Shannon), Gregory Thirloway (Dr. Mitchell Kaplan)
• Co-Starring: John Juliani (Dr. Harrison Lloyd), Paul Raskin (Dr. Eric Ilaqua)
• Featuring: Andrew Airlie (Attorney), Marie Stillin (Dr. Sally Sanford), Norman Armour (ER Doctor), Martin Evans (Dr. Hartman)
• Written By: Valerie Mayhew & Vivian Mayhew
• Directed By: Kim Manners

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: William B. Davis (Cigarette Smoking Man)
• Guest Starring: Morgan Weisser (Lee Harvey Oswald), Chris Owens (Young Cigarette Smoking Man), Donnelly Rhodes (General Francis), Tom Braidwood (Frohike), Bruce Harwood (Byers)
• And: Jerry Hardin (Deep Throat)
• Co-Starring: Dan Zukovic (Agent)
• Featuring: Peter Hanlon (Aide), Dean Aylesworth (Young Bill Mulder), Paul Jarrett (James Earl Ray), David Fredericks (Director), Laurie Murdoch (Lydon)
• Written By: Glen Morgan
• Directed By: James Wong

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner), William B. Davis (Cigarette Smoking Man)
• Guest Starring: Nicholas Lea (Alex Krycek), Laurie Holden (Marita Covarrubius), John Neville (Well-Manicured Man), Brendan Beiser (Agent Pendrell)
• Special Guest Star: Fritz Weaver (Senator Sorenson)
• Co-Starring: Malcolm Stewart (Dr. Sacks), David Bloom (Stress Man), Campbell Lane (Chairman)
• Featuring: Stefan Arngrim (Prisoner), Brent Stait (Timothy Mayhew)
• Written By: Frank Spotnitz & Chris Carter
• Directed By: Kim Manners

• Tagline: E PUR SI MUOVE (Italian -- And Still It Moves)
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner), William B. Davis (Cigarette Smoking Man)
• Guest Starring: Nicholas Lea (Alex Krycek), John Neville (Well-Manicured Man), Stefan Arngrim (Prisoner)
• And: Jan Rubeš (Vassily Peskow)
• Special Guest Star: Fritz Weaver (Senator Sorenson)
• Co-Starring: Brent Stait (Timothy Mayhew), Malcolm Stewart (Dr. Sacks), Campbell Lane (Chairman)
• Featuring: Robin Mossley (Dr. Kingsley Looker), Brenda McDonald (Auntie Janet), Pamela MacDonald (Nurse), Eileen Pedde (Angie), Jessica Schreier (Dr. Charne-Sayre)
• Written By: Frank Spotnitz & Chris Carter
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Tom Noonan (John Lee Roche)
• Co-Starring: Byrne Piven (Frank Sparks), Rebecca Toolan (Mrs. Mulder)
• Featuring: Jane Perry (Day Care Operator), Vanessa Morley (Samantha Mulder), Edward Diaz (El Camino Owner), Paul Bittante (Local Cop), Carly McKillip (Caitlin Ross)
• Written By: Vince Gilligan
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Rubén Blades (Conrad Lozano), Raymond Cruz (Eladio Buente), José Yenque (Soledad Buente), Simi (Gabrielle Buente), Lillian Hurst (Flakita)
• Featuring: Susan Bain (County Coroner), Robert Thurston (Dr. Larry Steen), Michael Kopsa (Rick Culver), Markus Hondro (Barber), Janeth Munoz (Village Woman), Pamela Diaz (Maria Dorantes), Fabricio Santin (Migrant Worker), Jose Vargas (I.N.S. Worker), Tony Dean Smith (Store Clerk)
• Written By: John Shiban
• Directed By: Tucker Gates

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Paul McCrane (Leonard Betts), Marjorie Lovett (Elaine Tanner), Jennifer Clement (Michele Wilkes)
• Co-Starring: Bill Dow (Charles Burks)
• Featuring: Sean Campbell (Local Cop), Dave Hurtubise (Pathologist), Peter Bryant (Uniformed Cop), Laara Sadiq (Female EMT), J. Douglas Stewart (Male EMT), Brad Loree (Security Guard)
• Written By: Vince Gilligan & John Shiban & Frank Spotnitz
• Directed By: Kim Manners

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Rodney Rowland (Ed Jerse), Jodie Foster (Voice of Betty)
• Co-Starring: Bill Croft (Comrade Svo), Jay Donohue (Detective Gouveia)
• Featuring: B.J. Harrison (Hannah), Jillian Fargey (Kaye Schilling), Jan Bailey Mattia (Ms. Hadden), Igor Morozov (Pudovkin), Ian Robison (Detective Smith)
• Written By: Glen Morgan & James Wong
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner), William B. Davis (Cigarette Smoking Man)
• Guest Starring: Sheila Larken (Margaret Scully), David Lovgren (Kurt Crawford), Gillian Barber (Penny Northern), Tom Braidwood (Frohike), Dean Haglund (Langly), Bruce Harwood (Byers)
• Featuring: Morris Panych (Gray-Haired Man), Sean Allen (Dr. Kevin Scanlon), Julie Bond (Woman)
• Written By: Chris Carter & Vince Gilligan & John Shiban & Frank Spotnitz
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Justine Miceli (Ariel Luria), David Groh (Jacob Weiss), David Wohl (Kenneth Ungar), Channon Roe (Derek Banks)
• Co-Starring: Harrison Coe (Issac Luria), Jonathon Whittaker (Curt Brunjes)
• Featuring: Timur Karabilgin (Tony), Jabin Litwiniec (Clinton), George Gordon (Detective), Murrey Rabinovitch (1st Hasidic Man), David Freedman (Rabbi)
• Written By: Howard Gordon
• Directed By: Kim Manners
• Memoriam: In Loving Memory of Lillian Katz

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Peter Lacroix (Nathaniel Teager), Scott Hylands (General Benjamin Bloch), Laurie Holden (Marita Covarrubius), William Taylor (General Leitch), William Nunn (General Jon Steffan)
• Co-Starring: Larry Musser (Denny Markham), Lesley Ewen (Renee Davenport), Ryan Michael (Agent Cameron Hill)
• Featuring: Allan Franz (Dr. Ben Keyser), Jen Jasey (Female Private), Mark Holden (Agent Eugene Chandler), Don McWilliams (PFC Gus Burkholder)
• Teleplay By: Howard Gordon & Chris Carter
• Story By: Howard Gordon
• Directed By: Michael Lange

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Joe Spano (Mike Millar), Tom O'Brien (Corporal Louis Frish), Scott Bellis (Max Fenig), Chilton Crane (Sharon Graffia), Brendan Beiser (Agent Pendrell)
• Co-Starring: Greg Michaels (Scott Garrett)
• Featuring: Robert Moloney (Bruce Bearfeld), Felicia Shulman (Motel Manager), Rick Dobran (Sergeant Armando Gonzales), Jerry Schram (Larold Rebhun), David Pálffy (Dark Man), Mark Wilson (Pilot), Marek Wiedman (Investigator), Jon Raitt (Father)
• Written By: Chris Carter & Frank Spotnitz
• Directed By: Rob Bowman

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Joe Spano (Mike Millar), Tom O'Brien (Corporal Louis Frish), Scott Bellis (Max Fenig), Chilton Crane (Sharon Graffia), Brendan Beiser (Agent Pendrell)
• Co-Starring: Greg Michaels (Scott Garrett)
• Featuring: John Destry (Mr. Ballard), Rick Dobran (Sergeant Armando Gonzales), Jerry Schram (Larold Rebhun), David Pálffy (Dark Man), Mark Wilson (Pilot)
• Written By: Chris Carter & Frank Spotnitz
• Directed By: Kim Manners

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Joseph Fuqua (Jason Nichols), Susan Lee Hoffman (Lisa Ianelli), Michael Fairman (Older Jason Nichols)
• Featuring: Jed Rees (Lucas Menand), Hiro Kanagawa (Dr. Yonechi), Jonathan Walker (Chuck Lukerman), Alison Matthews (Doctor), Norman Armour (Coroner), Patricia Idlette (Desk Clerk), Brent Chapman (Security Cop), Terry Arrowsmith (Uniformed Cop), Aureleo Di Nunzio (Detective)
• Written By: Howard Gordon & David Greenwalt
• Directed By: James Charleston

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner)
• Guest Starring: Darin Morgan (Eddie Van Blundht), Christine Cavanaugh (Amanda Nelligan), Lee de Broux (Eddie Van Blundht, Sr.)
• Co-Starring: Robert Rozen (Dr. Alton Pugh), Paul McGillion (Angry Husband), Jennifer Sterling (Angry Wife), David Cameron (Deputy)
• Featuring: Forbes Angus (Security Guard), Peter Kelamis (Second Husband), P. Lynn Johnson (Health Department Doctor), Carrie Cain Sparks (Duty Nurse)
• Written By: Vince Gilligan
• Directed By: Cliff Bole

• Tagline: THE TRUTH IS OUT THERE
• Also Starring: Mitch Pileggi (Assistant Director Walter Skinner), William B. Davis (Cigarette Smoking Man)
• Guest Starring: Laurie Holden (Marita Covarrubius)
• Co-Starring: Nicolle Nattrass (Misty), Paul McLean (Special Agent Kautz), Fred Keating (Detective Ray Thomas), Allan Gray (Entomologist)
• Featuring: Addison Ridge (Bespectacled Boy), Don S. Williams (1st Elder), Lisa Stewart (Jane Brody), Barry Greene (Dr. Emile Linzer), Christopher J. Newton (Photo Technician), Morris Panych (Gray Haired Man)
• Written By: Howard Gordon & Frank Spotnitz
• Directed By: Kim Manners
• Memorium: In Loving Memory of Vito J. Pileggi (Father of Mitch Pileggi)

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Steven M. Porter (Harold Spuller), Alex Bruhanski (Angelo Pintero), Sydney Lassick (Chuck Forsch), Nancy Fish (Nurse Innes), Daniel Kamin (Detective Hudak)
• Featuring: Lorena Gale (Attorney), Mike Puttonen (Martin Alpert), Christine Willes (Karen Kosseff), Ken Tremblett (Uniformed Officer)
• Written By: John Shiban
• Directed By: James Charleston

• Tagline: THE TRUTH IS OUT THERE
• Guest Starring: Jay Acovone (Detective Joe Curtis), Mike Nussbaum (Dr. Charles Goldstein), Chris Owens (Young Cigarette-Smoking Man), Rebecca Toolan (Mrs. Mulder)
• Featuring: Andrew Johnston (Medical Examiner), Terry Jang Barclay (Officer Imhof), Vanessa Morley (Young Samantha), Eric Breker (Admitting Officer), Rebecca Harker (Housekeeper), Shelley Adam (Young Mrs. Mulder), Dean Aylesworth (Young Bill Mulder), Alex Haythorne (Young Mulder)
• Written By: R.W. Goodwin
• Directed By: Kim Manners

• Tagline: BELIEVE THE LIE
• Guest Starring: John Finn (Scott Kritschgau), Matthew Walker (Arlinsky), James Sutorius (Babcock), Sheila Larken (Margaret Scully), Pat Skipper (Bill Scully, Jr.), John Oliver (Rolston), Charles Cioffi (Section Chief Scott Blevins)
• Co-Starring: Steve Makaj (Ostelhoff), Nancy Kerr (Agent Hedin)
• Featuring: Barry W. Levy (Vitagliano), Arnie Walters (Father McCue), Rob Freeman (Detective Rempulski), Craig Brunanski (Saw Operator)
• Written By: Chris Carter
• Directed By: R.W. Goodwin