X-Files guest stars
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Season 1
Episode Name: Deep Throat
Original Air Date: 17 September 1993 (Season 1, Episode 1)
As: Emil
Well Known In: The Italian Job (2003) , "Buffy the Vampire Slayer" (1997) (TV series)

Episode Name: Squeeze
Original Air Date: 24 September 1993 (Season 1, Episode 2)
As: Agent Tom Colton
Well Known In: "Grounded for Life" (2001-2005) (TV series) and "Terriers" (2010) (TV series)

Episode Name: Squeeze
Original Air Date: 24 September 1993 (Season 1, Episode 2)
Episode Name: Tooms
Original Air Date: 22 April 1994 (Season 1, Episode 20)
As: Eugene Victor Tooms
Well Known In: The Green Mile (1999)

Episode Name: Ice
Original Air Date: 5 November 1993 (Season1, Episode 7)
As: Dr. Nancy Da Silva
Well Known In: "Desperate Housewives" (2004) (TV series)

Thanks to teeter for the suggestion
Episode Name: "Beyond the Sea" and "One Breath"
Original Air Date: 7 January 1994 (Season 1, Episode 12), 11 November 1994 (Season 2, Episode 8).
As: Captain William Scully
Well Known In: "Twin Peaks" (1990) (TV series)

Episode Name: Beyond the Sea
Original Air Date: 7 January 1994 (Season 1, Episode 12)
As: Luther Lee Boggs
Well Known In: "Deadwood" (2004) (TV series)


Season 2
Episode Name: Blood
Original Air Date: 30 September 1994 (Season 2, Episode 3)
As: Edward Funsch
Well Known In: "Deadwood" (2004) (TV series)

Episode Name: Duane Barry
Original Air Date: 14 October 1994 (Season 2, Episode 5)
As: Agent Lucy Kazdin
Well Known In: "The Shield" (2002) (TV series)

Episode Name: 3
Original Air Date: 4 November 1994 (Season 2, Episode 7)
As: Kristen Kilar
Well Known In: "Entourage" (2004) (TV series)

Thanks to boldaslove for the suggestion
Episode Name: Firewalker
Original Air Date: 18 November 1994 (Season 2, Episode 9)
As: Jessie O'Neil
Well Known In: Saw (2004)

Episode Name: Aubrey
Original Air Date: 6 January 1995 (Season 2, Episode 12)
As: Lt. Brian Tillman
Episode Name: Trust No 1
Original Air Date: 6 January 2002 (Season 9, Episode 6)
As: Shadow Man
Well Known In: "Lost" (2004) (TV series)


Season 3
Episode Name: D.P.O
Original Air Date: 6 October 1995 (Season 3, Episode 3)
As: Bart 'Zero' Liquori
Well Known In: Tropic Thunder (2008), Tenacious D in The Pick of Destiny (2006)

Episode Name: D.P.O
Original Air Date: 6 October 1995 (Season 3, Episode 3)
As: Darin Peter Oswald
Well Known In: Gone in Sixty Seconds (2000), Cold Mountain (2003)

Episode Name: Clyde Bruckman's Final Repose
Original Air Date: 13 October 1995 (Season 3, Episode 4)
As: Clyde Bruckman
Well Known In: "Everybody Loves Raymond" (1996) (TV series)

Episode Name: Oubliette
Original Air Date: 17 November 1995 (Season 3, Episode 8)
As: Amy Jacobs
Well Known In: "Firefly" (2002) (TV series)

Episode Name: Revelations
Original Air Date: 15 December 1995 (Season 3, Episode 11)
As: Reverend Patrick Findley
Well Known In: Full Metal Jacket (1987)

Episode Name: Syzygy
Original Air Date: 26 January 1996 (Season 3, Episode 13)
As: Jay 'Boom' DeBoom
Well Known In: "Two Guys, a Girl and a Pizza Place" (1998) (TV series)

Episode Name: Grotesque
Original Air Date: 2 February 1996 (Season 3, Episode 14)
As: Agent Bill Patterson
Well Known In: "That '70s Show" (1998) (TV series)


Season 4

Season 5
Episode Name: Bad Blood
Original Air Date: 22 February 1998 (Season 5, Episode 12)
As: Sheriff Hartwell
Well Known In: My Super Ex-Girlfriend (2006), Idiocracy (2006)

Episode Name: Travelers
Original Air Date: 29 March 1998 (Season 5, Episode 15)
As: Edward Skur
Well Known In: "Deadwood" (2004) (TV series)


Season 6
Episode Name: The Beginning
Original Air Date: 8 November 1998 (Season 6, Episode 1)
As: Orderly
Well Known In: "The Shield" (2002) (TV series)

Episode Name: Drive
Original Air Date: 15 November 1998 (Season 6, Episode 2)
As: Patrick Crump
Well Known In: "Malcolm in the Middle" (2000) (TV series), "Breaking Bad" (2008) (TV series)

Episode Name: Terms of Endearment
Original Air Date: 3 January 1999 (Season 6, Episode 7)
As: Wayne Weinsider
Well Known In: The Evil Dead Trilogy

Episode Name: Tithonus
Original Air Date: 24 January 1999 (Season 6, Episode 10)
As: Agent Peyton Ritter
Well Known In: "Two Guys, a Girl and a Pizza Place" (1998) (TV series)

Episode Name: Trevor
Original Air Date: 11 April 1999 (Season 6, Episode 17)
As: June Gurwich
Well Known In: "The Shield" (2002) (TV series)

Episode Name: Milagro
Original Air Date: 18 April 1999 (Season 6, Episode 18)
As: Phillip Padgett
Well Known In: "Deadwood" (2004) (TV series)


Season 7
Episode Name: The Goldberg Variation
Original Air Date: 12 December 1999 (Season 7, Episode 6)
As: Richie Lupone
Well Known In: Transformers (2007), Indiana Jones and the Kingdom of the Crystal Skull (2008)

Episode Name: First Person Shooter
Original Air Date: 27 February 2000 (Season 7, Episode 13)
As: Phoebe
Well Known In: "Entourage" (2004) (TV series)

Episode Name: Brand X
Original Air Date: 16 April 2000 (Season 7, Episode 18)
As: Ashman / Darryl Weaver
Well Known In: Saw (2004)

Episode Name: Fight Club
Original Air Date: 7 May 2000 (Season 7, Episode 20)
As: Betty Templeton / Lulu Pfeiffer


Season 8
Episode Name: Redrum
Original Air Date: 10 December 2000 (Season 8, Episode 6)
As: Martin Wells
Well Known In: Terminator 2: Judgment Day (1991) , "Eureka" (2006) (TV series)

Episode Name: Redrum
Original Air Date: 10 December 2000 (Season 8, Episode 6)
As: Spider-Man / Cesar Ocampo
Well Known In: Desperado (1995), From Dusk Till Dawn (1996)


Season 9
Episode Name: Nothing Important Happened Today, Nothing Important Happened Today II, 4-D, Provenance, Providence, Release.
Original Air Date: 11 November 2001 (Season 9, Episode 1 - Season 9, Episode 17)
As: FBI Assistant Director Brad Follmer
Well Known In: Robin Hood: Men in Tights (1993) , Saw (2004)

Episode Name: Underneath
Original Air Date: 31 March 2002 (Season 9, Episode 12)
As: Robert M. Fassl
Well Known In: "Deadwood" (2004) (TV series)

Episode Name: Underneath
Original Air Date: 31 March 2002 (Season 9, Episode 12)
As: Duke Tomasick
Well Known In: "The Sopranos" (1999) (TV series)

Episode Name: Improbable
Original Air Date: 7 April 2002 (Season 9, Episode 13)
As: Mr. Burt
Well Known In: Boogie Nights (1997)

Episode Name: Improbable
Original Air Date: 7 April 2002 (Season 9, Episode 13)
As: Mad Wayne
Well Known In: "Deadwood" (2004) (TV series)

Episode Name: Sunshine Days
Original Air Date: 12 May 2002 (Season 9, Episode 18)
As: Oliver Martin
Well Known In: "Lost" (2004) (TV series)

These are the guest stars (of well known tv-show actors or movie actors) i've seen in X-Files. Please tell me if there are people I forgot.
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