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Terriers and Sons of Anarchy star Donal Logue showed up as an FBI agent and friend of Scully in “Squeeze,” the episode that introduced recurring (and super disgusting) villain, Eugene Victor Tooms.

Oscar nominee Felicity Huffman is better known for her career on Desperate Housewives, but in The X-Files she played a scientist trapped in an Alaskan outpost.

Deadwood’s Brad Dourif played a psychic serial killer named Luther Lee Boggs in “Beyond The Sea.”

Supernatural mainstay Mark Sheppard played a pyrokinetic sociopath in the aptly titled “Fire.”

You’ll probably recognize him from hits like The West Wing and Cabin In The Woods, but before he was advising fictional presidents Bradley Whitford was playing a troubled geologist in The X-Files’ “Firewalker.”

Also known as Locke from Lost, Terry O’Quinn’s Lt. Brian Tillman would make two appearances in the show and later guest star in the first movie.

Breaking Bad’s Hank Shraeder, Dean Norris, played a role in the deeply disgusting “F. Emasculata.”

Beloved character actor Tony Shalhoub played a riff on Bruce Banner in “Soft Light” where he was a mild-mannered scientist named Dr. Banton who was irradiated in an experiment.

The man, the myth, the legend, Jack Black played a hapless arcade employee named Zero in “D.P.O.”

Known for his roles in Sneaky Pete and Avatar, Giovanni Ribisi played a troubled kid with an obsessive crush on his high school teacher and the ability to control lightning in “D.P.O.” He also murdered Jack Black’s character. R.I.P.

The late Peter Boyle of Young Frankenstein and Everybody Loves Raymond fame played a reluctant psychic whose ability to predict the future came from his love of The Big Bopper in “Clyde Bruckman’s Final Repose.”

Before he was Deadpool, Ryan Reynolds was busy being a high school jock turned cult murder victim in “Syzygy.”

Crooner Michael Bublé played an unnamed background character (no really) in the WW2 flashback parts of “Piper Maru.”

Before her big break on Ally McBeal, Lucy Liu played the daughter of a gambler in over his head in “Hell Money.”

Law & Order SVU’s BD Wong joined Liu as a detective investigating a supernatural gambling ring in “Hell Money.”

Game show host Alex Trebek played a shady government Man In Black (who looked suspiciously like game show host Alex Trebek) in the legendary “Jose Chung’s From Outer Space.”

Wrestling superstar Jesse Ventura joined Trebek as a Man In Black in “Jose Chung’s From Outer Space.”

Manhunter and Last Action Hero star Tom Noonan played a memento-collecting killer in “Paper Hearts.”

Jodie Foster didn’t actually make an on-screen cameo, but she did provide the voice for a cursed tattoo in “Never Again.”

Unofficially crossing the X-Files over with Law & Order SVU, Richard Belzer guest starred as Det. John Munch. Talk about a cinematic shared universe.

Talk show host Jerry Springer played himself in the wildly funny “Post-Modern Prometheus.”

Young Luke Wilson appeared as Sheriff Hartwell in the vampire-comedy episode, “Bad Blood.”

Walter White himself, Bryan Cranston, guest starred as Patrick Crump, a man suffering a strange affliction causing him to drive west or die in “Drive.”

Comedian and actor Lily Tomlin played a ghost named Lyda in “How The Ghosts Stole Christmas.”

Horror legend Bruce Campbell played a man who may or may not have fathered a demonic baby in “Terms Of Endearment.”

The Flash’s Jesse L. Martin played an extraterrestrial baseball player in “The Unnatural.”

Before he was in Deadwood and Supernatural, Jim Beaver had a bit part as a coroner in “Field Trip.”

In an episode that crossovered with creator Chris Carter’s other series, Millennium, Lance Henriksen, aka Bishop from Aliens, appeared as Frank Black.

Also in the Millennium crossover episode was Octavia Spencer, playing the aptly named Nurse Octavia.

Yet another Millennium episode cameo was legendary TV personality Dick Clark as himself.

Ann Dowd of The Leftovers and Hereditary fame appeared as the mother of a supernatural teenager in “Rush.”

Baby Shia LeBeouf appears in an episode about unlikely chains of events titled “The Goldberg Variation.”

Emmy nominee and Entourage star Constance Zimmer guest starred in the hilariously ’90s “First Person Shooter.”

Comedian Garry Shandling appears in the in-universe X-Files movie as Mulder for the episode “Hollywood A.D.”

Bad Boys and Madam Secretary star Tea Leoni played Scully for the in-universe X-Files movie in “Hollywood A.D.” She was married to David Duchovny at the time.

Comedian Kathy Griffin played identical twins Betty Templeton and Lulu Pfeiffer in “Fight Club.”

Professional wrestler Rob Van Dam also guest starred alongside Griffin in “Fight Club.”

Mad TV alum Will Sasso played a man who accidentally summoned a genie in “Je Souhaite.”

Cult favorite Danny Trejo played a gangster in Season 8’s “Redrum.”

Zach Grenier of Devs played a medical doctor named Herman Stites in “Alone.”

Xena herself, Lucy Lawless stars as an immortal super soldier in “Nothing Important Happened Today” parts one and two.

Glee’s Jane Lynch played the mom of a rowdy teenager in the disgusting “Lord Of The Flies.”

Aaron Paul of Breaking Bad fame was the main villain, a teenager who could control insects, in “Lord Of The Flies.”

Burt Reynolds played a fictional version of himself that also may or may not be the face of God in “Improbable.”

Community’s Joel McHale played a conspiracy podcaster named Tad O’Malley in “My Struggle.”

Comedian (and X-Files fan podcaster) Kumail Nanjiani played an animal control officer in “Mulder And Scully Meet The Weremonster.”

Comedian Rhys Darby played the titular weremonster in “Mulder And Scully Meet The Weremonster.”

Haley Joel Osment of The Sixth Sense fame played a haunted Vietnam vet in “Kitten.”