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Across six decades, Star Trek has boldly gone where no series has gone before — and it’s brought a galaxy of unexpected guest stars along for the ride. From rock icons and future Oscar winners to comedic legends and early-career appearances by actors who would later define Hollywood, the franchise has always drawn an eclectic mix of talent. Some of these performances were fleeting, others unforgettable, but all of them added something special to the ever-expanding Trek universe. Here are 12 of the most surprising and iconic Star Trek guest stars you might have forgotten appeared, ranked from memorable to legendary.
12. Kirsten Dunst (Star Trek: The Next Generation – “Dark Page”)
Before Interview with the Vampire and Spider-Man, a young Kirsten Dunst played Hedril, a telepathic child who helps Lwaxana Troi (Majel Barrett) uncover repressed trauma. Dunst’s performance was far beyond her years, bringing quiet empathy and maturity to one of TNG’s most emotional episodes. Her scenes opposite Barrett are surprisingly raw, exploring grief and memory through sci-fi allegory. For many fans, it’s a reminder that even side stories in Star Trek can deliver deep emotional resonance.
11. Teri Garr (Star Trek: The Original Series – “Assignment: Earth”)
Before Tootsie and Young Frankenstein, the late Teri Garr appeared in the 1968 episode “Assignment: Earth,” which was actually meant as a pilot for a spinoff series that never materialized. As secretary-turned-spy Roberta Lincoln, Garr displayed the wit and charm that would later make her a comedy star. Though she distanced herself from the role later in her career, fans remember it as a snapshot of 1960s Trek camp done right — complete with Cold War intrigue, vintage mod fashion, and Garr’s scene-stealing curiosity.
10. Kelsey Grammer (Star Trek: The Next Generation – “Cause and Effect”)
In one of TNG’s cleverest time-loop episodes, Kelsey Grammer appears in the final scene as Captain Morgan Bateson of the USS Bozeman, a ship lost in a temporal rift for 90 years. It’s a blink-and-you’ll-miss-it cameo, but Grammer’s presence gives the twist ending real gravitas. Dressed in a classic Starfleet uniform, he exudes that cool, patrician confidence that would later define Frasier. Fans still speculate that Bateson’s story could fuel a future Trek spinoff.
9. Iggy Pop (Star Trek: Deep Space Nine – “The Magnificent Ferengi”)
The Godfather of Punk brought his trademark eccentricity to the Gamma Quadrant as Yelgrun, a snarky Vorta who oversees a Ferengi prisoner exchange. With his wiry frame, expressive face, and deadpan humor, Iggy Pop gave the role an otherworldly edge that fit DS9’s darker, quirkier tone. His chemistry with the Ferengi cast made for one of the show’s funniest—and strangest—episodes. It’s the kind of cameo that perfectly bridges Star Trek’s worlds of sci-fi, satire, and rock-and-roll cool.
8. Sarah Silverman (Star Trek: Voyager – “Future’s End”)
Before her breakout as a comedy icon, Sarah Silverman co-starred in the Voyager two-parter “Future’s End” as Rain Robinson, a 20th-century astronomer who unwittingly helps stop a temporal disaster. Silverman’s blend of sarcasm and sincerity played beautifully off the stoic Voyager crew, particularly Tom Paris (Robert Duncan McNeill). Her character’s curiosity about the stars mirrored the show’s sense of wonder, and her easy charisma made her one of the most memorable guest stars of Voyager’s run.
7. Whoopi Goldberg (Star Trek: The Next Generation)
While she appeared multiple times, Whoopi Goldberg’s role as Guinan remains one of Star Trek’s most powerful guest star turns. Already an Oscar winner when she joined TNG, Goldberg’s presence brought gravitas and warmth to Ten Forward. Her enigmatic friendship with Captain Picard and quiet wisdom made her scenes unforgettable. Guinan became so beloved that Goldberg reprised the role decades later in Star Trek: Picard, proving that her impact transcends generations of Trek storytelling.
6. Tom Hardy (Star Trek: Nemesis)
In his early 20s, a virtually unknown Tom Hardy took on the challenging role of Shinzon, a tortured clone of Captain Picard, in Star Trek: Nemesis. Though the film divided fans, Hardy’s performance was hauntingly intense — full of vulnerability and rage. Watching it now, it’s clear this was the birth of a major talent. His cold stare and conflicted humanity made Shinzon one of Trek’s most psychologically complex villains, even if the film itself struggled to match his depth.
5. Dwayne “The Rock” Johnson (Star Trek: Voyager – “Tsunkatse”)
Before conquering Hollywood, Dwayne “The Rock” Johnson made his TV acting debut as a Pendari fighter in Voyager’s gladiatorial episode “Tsunkatse.” It could have been pure stunt casting, a WWF/WWE tie-in during peak wrestling popularity, but Johnson played it straight, giving Seven of Nine (Jeri Ryan) a formidable, charismatic opponent. His presence helped the episode become a ratings hit and offered early proof that he had the star power to command the screen beyond the wrestling ring.
4. Joan Collins (Star Trek: The Original Series – “The City on the Edge of Forever”)
Often cited as the finest Star Trek episode ever made, “The City on the Edge of Forever” owes much of its emotional power to Joan Collins’ moving portrayal of Edith Keeler. As a compassionate Depression-era social worker, Collins brought tenderness and tragedy to a role that forever shaped Captain Kirk’s character. Her doomed romance with him remains one of television’s great heartbreaks — and a masterclass in how Trek balances time-travel spectacle with profound humanity.
3. Christian Slater (Star Trek VI: The Undiscovered Country)
A lifelong Star Trek fan, Christian Slater begged his mother, the film’s casting director, for a cameo in The Undiscovered Country, and she obliged. His brief appearance as an Excelsior communications officer reporting to Captain Sulu lasts mere seconds, but it’s become a cherished Easter egg. Seeing a Hollywood heartthrob sneaking into the Trek universe for love of the franchise perfectly embodies fandom at its best. It’s the ultimate “did you know?” moment for Star Trek trivia buffs.
2. Mick Fleetwood (Star Trek: The Next Generation – “Manhunt”)
Yes, that Mick Fleetwood, the drummer and co-founder of Fleetwood Mac, appeared on TNG as an Antedean ambassador in full prosthetic makeup. He was unrecognizable, but absolutely thrilled to be there, reportedly shaving his beard to fit under the elaborate costume. Though the character never speaks, knowing it’s Fleetwood adds a layer of delightful absurdity to the episode. It’s one of the best examples of Star Trek’s long history of attracting celebrity superfans who just wanted to join the fun.
1. Stephen Hawking (Star Trek: The Next Generation – “Descent, Part I”)
No guest cameo in Star Trek history carries more symbolic weight than Stephen Hawking’s. Appearing as himself in a holodeck poker game with Data, Einstein, and Newton, the famed physicist became the only person ever to play “himself” in the Trek universe. The moment is short but profound, the real-world embodiment of Star Trek’s dream of science and exploration inspiring one another. When the future’s greatest minds meet the galaxy’s greatest imagination, that’s Star Trek at its purest.
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