One thing we've always loved about Star Trek is the sheer size and range of celebrities who have appeared in the series over the years. You can switch on almost any episode of Star Trek and be sure to see a well-known face back when they were just starting out in their career. Here is our list of the 22 most obscure Star Trek appearance of all time.
Abdullah II King of Jordan
Die-hard Star Trek fan King Abdullah couldn't pass up the chance of a cameo appearance in Voyager back when he was the prince of Jordan.
Andy Dick
Andy Dick is known for NewsRadio, The Andy Dick Show, and Dancing With The Stars.
Terry O'Quinn
Terry O'Quinn is best known as John Locke on the ABC show Lost.
Stephen Hawking
Stephen Hawking had a cameo role playing a hologram of himself in an episode of The Next Generation. Hawking is the only person with the honor of portraying themselves on any Star Trek production.
Kim Cattrell
The Sex And The City star played a Vulcan in Star Trek VI: The Undiscovered Country.
Kelsey Grammer
Kelsey is best known for his character of Frasier on the TV series Cheers, and it's spin-off show Frasier.
Kirstie Alley
Grammer's Cheers co-star Kirstie Alley also had a notable Star Trek appearance as Saavik in Star Trek II.
Christian Slater
Slater has had roles in Robin Hood: Prince of Thieves, Interview with the Vampire and Alias.
Tom Morello
Morello is the lead guitarist in the rock bands Rage Against the Machine and Audioslave.
Christopher Lloyd
Lloyd is most famous for his rol as 'Doc' Brown in the back to the Future series. He also played Uncle Fester in the Addams Family movies.
Teri Hatcher
Hatcher made her name for herself playing Lois Lane in The New Adventures of Superman. She later joined the acclaimed show Desperate housewives.
Ken Jenkins
Ken Jenkins is best known for his role as Dr. Bob Kelso on the medical sitcom Scrubs.
Kirsten Dunst
Long before she was Mary Jane to Tobey Maguire's Spider-Man, Kirsten played a telepathic alien with a rather unusual bald patch above her ears.
Ashley Judd
Ashley appeared in two different episodes of TNG as the target of Wesley Crusher's affections.
Seth Macfarlane
Seth Macfarlane is best known as the creator of family guy, and the voice actor for several of the main characters.
Sarah Silverman
Silverman took the center stage for a two-part episode of Voyager.
Iggy Pop
Iggy Pop is best known as the lead singer of the proto-punk band The Stooges. This is one of the rare photographs of Iggy wearing a shirt.
Mick Fleetwood
Mick is the drummer for the seminal band Fleetwood mac. He was totally unrecognizable as a member of a fish-like species known as the Antedians.
Dwayne "The Rock" Johnson
The rock made a surprise appearance in the Voyager episode Tsunkatse.
Famke Janssen
Dutch actress Famke is known for her roles as Xenia Onatopp in GoldenEye, and later as Jean Grey in the X-men series.
Bryan Singer
Speaking of X-men, the series is directed by Bryan Singer who had an uncredited cameo in Star Trek: Nemesis.
Jason Alexander
Best known as George on Seinfeld, Jason appeared as a bumpy-headed alien in the Voyager episode Think Tank.
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