Star Trek has been a launching pad for countless actors since the original series premiered in 1966. From small guest spots to recurring roles, many future stars got their start aboard the Enterprise or other Federation vessels. While some actors became household names after their Trek appearances, others had already established careers but took brief detours into the final frontier. Here’s a look at 15 surprising actors who beamed into the Star Trek universe before or during their rise to fame.
1. Dwayne “The Rock” Johnson
Before becoming Hollywood’s highest-paid actor, Dwayne Johnson appeared as an alien gladiator in Star Trek: Voyager. His character, the Pendari Champion, fought Seven of Nine in the episode “Tsunkatse” while The Rock was still primarily known as a WWE wrestler.
The 1999 appearance showcased his early acting chops and signature eyebrow raise. Johnson even performed his own stunts during the fighting sequences, impressing the cast and crew with his physical abilities.
Fans of both wrestling and Star Trek were thrilled by the crossover, making this episode one of Voyager’s highest-rated during its run.
2. Kirsten Dunst
A pint-sized Kirsten Dunst made her Star Trek appearance long before Spider-Man fame. At just six years old, she portrayed Hedril, a telepathic alien child in the Star Trek: The Next Generation episode “Dark Page” from 1993.
Her character shared emotional scenes with Marina Sirtis’ Counselor Troi and Majel Barrett’s Lwaxana Troi. Even at such a young age, Dunst demonstrated the acting talent that would later make her a Hollywood star.
This role came shortly after her breakthrough performance in Interview with the Vampire, showing her versatility across genres early in her career.
3. Tom Hardy
Mad Max and Venom star Tom Hardy played a young clone of Captain Picard in Star Trek: Nemesis. As Shinzon, Hardy delivered a chilling performance opposite Patrick Stewart in what would be the final Next Generation film.
Hardy was just 24 during filming, virtually unknown to American audiences. His intimidating presence and intensity foreshadowed the brooding characters he would later become famous for in films like The Dark Knight Rises.
Despite the film’s disappointing box office performance, Hardy’s portrayal stands as one of the most memorable villain performances in the franchise.
4. Ashley Judd
Ashley Judd appeared in Star Trek: The Next Generation before becoming a Hollywood leading lady. She played Ensign Robin Lefler in two episodes, including the fan-favorite “The Game” where she helps Wesley Crusher save the Enterprise from an addictive mind-control device.
Her character was smart, capable, and memorable enough that many fans wished she’d become a regular. Judd’s natural charisma shone through even in this early role.
Just a few years after her Star Trek appearance, Judd would become a major star with films like Kiss the Girls and Double Jeopardy.
5. Teri Hatcher
Years before Desperate Housewives made her a household name, Teri Hatcher beamed aboard the Enterprise-B in Star Trek Generations. She played Lieutenant B.G. Robinson, appearing briefly but memorably as a transporter officer in the film’s opening sequence.
Her scene with Captain Kirk was one of her earliest film roles, coming just before she landed her breakthrough part as Lois Lane in Lois & Clark: The New Adventures of Superman.
Though her screen time was limited, Hatcher’s appearance has become a fun trivia fact for both Trekkies and fans of her later television work.
6. Kirstie Alley
Before Cheers catapulted her to sitcom stardom, Kirstie Alley made her film debut as the Vulcan Lieutenant Saavik in Star Trek II: The Wrath of Khan. Her portrayal of the logical yet emotionally complex Vulcan-Romulan officer earned praise from fans and critics alike.
Alley’s performance included the memorable scene where she pilots the Enterprise through the Kobayashi Maru test. Despite the positive reception, she didn’t return for the sequels due to salary disputes.
Robin Curtis took over the role in subsequent films, but many Trekkies still consider Alley’s interpretation of Saavik the definitive version.
7. Seth MacFarlane
Family Guy creator Seth MacFarlane fulfilled his Trek dreams with two small roles in Enterprise. As a passionate lifelong fan, MacFarlane jumped at the chance to appear in the prequel series, playing Engineer Rivers in two episodes.
His first appearance came in “The Forgotten,” where he had a brief scene with Trip Tucker. MacFarlane later created The Orville, his own loving homage to Star Trek, showing how deeply his Trek fandom runs.
Few viewers recognized the animation mogul in his brief live-action appearances, making his Enterprise cameos some of the franchise’s best-kept secrets.
8. Famke Janssen
X-Men’s Jean Grey began her journey to stardom as a shapeshifting alien in Star Trek: The Next Generation. Famke Janssen played Kamala, an empathic metamorph who falls for Captain Picard in the episode “The Perfect Mate.”
Her character could sense and become whatever others desired most—a challenging role that showcased Janssen’s range. The episode aired in 1992, just three years before she broke through as Bond villain Xenia Onatopp in GoldenEye.
Janssen’s exotic beauty and commanding screen presence were already evident in this early role, which has become a favorite among Next Generation episodes.
9. Christian Slater
Hardcore Trekkie Christian Slater used his rising star power to secure a cameo in Star Trek VI: The Undiscovered Country. Playing a night-shift communications officer aboard the USS Excelsior, Slater’s brief scene was a dream come true for the actor.
His mother, Mary Jo Slater, was the casting director for the film, which likely helped him land the small role. The cameo came at the height of Slater’s early fame, following hits like Heathers and Pump Up the Volume.
Though he appears for less than a minute, Slater’s enthusiasm for being part of the Trek universe was evident in his energetic performance.
10. Sarah Silverman
Comedian Sarah Silverman took a detour into sci-fi as astronomer Rain Robinson in a two-part Star Trek: Voyager episode. Her character encounters time-traveling Voyager crew members in 1990s Los Angeles during “Future’s End.”
Silverman brought her trademark wit to the role, creating chemistry with Tim Russ’s Tuvok. The episodes aired in 1996, just as Silverman’s comedy career was beginning to take off.
Her character was so well-received that producers reportedly considered adding Rain Robinson as a regular cast member, though the idea was ultimately abandoned in favor of Seven of Nine.
11. Jason Alexander
Seinfeld’s George Costanza himself, Jason Alexander, guest-starred in Star Trek: Voyager while his sitcom was still on the air. Alexander played Kurros, the leader of a group of alien intellectuals called the Think Tank, in the aptly-named episode “Think Tank.”
His character offered to help Voyager escape a dangerous situation in exchange for Seven of Nine joining their group. Alexander’s performance showcased a more sinister side than his Seinfeld character, proving his range beyond comedy.
As a longtime Trek fan, Alexander considered the role a career highlight despite the challenges of acting under prosthetic makeup.
12. Iggy Pop
Punk rock legend Iggy Pop transformed into a Vorta alien named Yelgrun in Deep Space Nine. His appearance in the episode “The Magnificent Ferengi” surprised fans who never expected to see the shirtless stage-diving musician in full alien makeup.
Pop delivered his lines with a cool, menacing calm that contrasted with his wild stage persona. His character negotiated a prisoner exchange with a group of Ferengi, leading to some of the episode’s most humorous moments.
The casting choice came after producers learned Pop was a Star Trek fan who had expressed interest in appearing on the show.
13. Kelsey Grammer
Frasier star Kelsey Grammer made a surprising guest appearance as Captain Morgan Bateson in The Next Generation. His character commanded the USS Bozeman, a ship trapped in a time loop for 90 years in the episode “Cause and Effect.”
Grammer filmed his brief scene during a break from Cheers, which was running concurrently with TNG. His commanding presence made him perfect for the role of a Starfleet captain.
Though he appears only in the episode’s final moments, Grammer’s character became popular enough to be featured in later Star Trek novels and referenced in other Trek media.
14. Gabrielle Union
Before Bring It On and Bad Boys II fame, Gabrielle Union appeared in Star Trek: Deep Space Nine. She played N’Garen, a young Klingon officer serving aboard a Bird of Prey in the episode “Sons and Daughters.”
Though her role was small, Union made an impression even under heavy Klingon prosthetics. The episode aired in 1997, just as Union was beginning her Hollywood career.
Few fans realize that the glamorous actress once sported Klingon ridges and armor, making her brief Trek appearance a fun piece of trivia for both Union fans and Trekkies alike.
15. Kim Cattrall
Sex and the City’s Kim Cattrall played a Vulcan officer long before becoming Samantha Jones. As Lieutenant Valeris in Star Trek VI: The Undiscovered Country, Cattrall portrayed the first female Vulcan main character since the original series.
Her character served as Spock’s protégée but was ultimately revealed as a traitor involved in a conspiracy to sabotage peace talks with the Klingons. Cattrall lobbied hard for the role and even contributed ideas to her character’s backstory.
She studied Leonard Nimoy’s performance as Spock to perfect her Vulcan mannerisms, creating one of the most memorable antagonists in Trek film history.
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