In 1965, producer Gene Roddenberry cast him as Mr. Sulu in the second Star Trek pilot and eventually the Star Trek television series. While working on the show he appeared as Captain Nim in The Green Berets. It was intended that Sulu's role be expanded in the second season, but due to Takei's part in Green Berets, he only appeared in half the season, with his role being filled by Walter Koenig as Pavel Chekov. When Takei returned, the two had to share a dressing room and a single episode script. Takei admitted in an interview that he initially felt threatened by Walter's presence, but later grew to be friends with him as the image of the officers sharing the ship's helm panel side-by-side became iconic.
Takei has since appeared in numerous TV and film productions, including the first six Star Trek motion pictures, and today he is a regular on the science fiction convention circuit throughout the world. He has also acted and provided voice acting for several science fiction computer games, including Freelancer and numerous Star Trek games. In 1996, in honor of the 30th anniversary of Star Trek, he reprised his role as Captain Hikaru Sulu on an episode of Star Trek: Voyager, appearing as a memory of Lt. Tuvok, who served on the USS Excelsior under Sulu, during the events of Star Trek VI: The Undiscovered Country.
Takei is one of a number of Star Trek supporting cast members whose difficulties with William Shatner have become public. However, in an interview in the 2004 DVD set for the second season of Star Trek: The Original Series, Takei said of Shatner: "He's just a wonderful actor who created a singular character. No one could have done Kirk the way Bill did. His energy and his determination, that's Bill. And that's also Captain Kirk." He appeared alongside Shatner on the 2006 Comedy Central Roast of William Shatner in which the two mocked each other in good humor and embraced, Takei noting that he was "honored" to be there "despite our past tensions".
In a radio interview on The Adam Carolla Show on June 19, 2008, Takei implied that part of his problems with Shatner began when he came out of the closet for the first time and his sexuality was accepted by almost everyone on the cast and crew of Star Trek except Shatner. Shatner was a guest on the same radio show some weeks earlier and expressed complete bewilderment as to why George Takei has such difficulties with him. According to Shatner, he has asked Takei repeatedly over the years to discuss his differences with him, but has been repeatedly rebuffed.
Takei is also one of six actors (the other actors being Jonathan Frakes, Kate Mulgrew, Michael Dorn, Avery Brooks and Majel Barrett) to lend his voice to Star Trek: Captain's Chair, reprising his role of Captain Hikaru Sulu when users visit the bridge of the original Enterprise in the computer game.
In the summer of 2007, Takei reprised his role of Sulu in the fan-made Internet based series Star Trek New Voyages: Phase II.
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