<P> There, Spock's katra is reunited with his body in a dangerous procedure called fal - tor - pan . The ceremony is successful and Spock is resurrected, alive and well, though his memories are fragmented . At Kirk's prompting, Spock remembers he called Kirk "Jim" and recognizes the crew . </P> <P> William Shatner reprises the role of Admiral James T. Kirk, Starfleet officer . Shatner remarked that being directed by Leonard Nimoy, his longtime co-star and friend, was initially awkward, although as the shoot went on, it became easier as Shatner realized how confident Nimoy was . To reduce weight, Shatner dieted before the start of production, but as filming continued, he tended to "slip"; the costume department had to make 12 shirts for him . In his book with Chris Kreski, Star Trek Movie Memories: The Inside Story of the Classic Movies, he believes that the scene where he learns of his son's death is "Kirk's finest celluloid moment ever". </P> <P> Nimoy, in addition to his directing duties, appears towards the end of the film as Spock, but only appears in the opening credits as the director . Nimoy found the most difficult scene to direct was one in which Leonard McCoy talks to the unconscious Spock in sickbay, en route to Vulcan . Nimoy recalled that not only was he in the scene, but his eyes are closed, making it difficult to judge the quality of the shot or the actor's performance: "It drove DeForest Kelley crazy . He swears that I was trying to direct him with the movement and flutter of my eyelids ." Nimoy was thankful the story required him to appear in a minimal number of scenes . The rapidly aging Spock, at the ages of 9, 13, 17, and 25, was portrayed successively by Carl Steven, Vadia Potenza, Stephen Manley and Joe W. Davis . Frank Welker provided Spock's screams, and Steve Blalock doubled for Nimoy, so that a total of seven actors contributed to the role . </P> <P> DeForest Kelley returns as Leonard McCoy, doctor and the carrier of Spock's living spirit . Kelley has the majority of the film's memorable scenes, but admitted to occasional difficulties in acting with and being directed by his longtime co-star . However, he has declared that he had no doubts about Nimoy's ability to direct the film . Responding to suggestions that Star Trek copied Star Wars, Kelley asserted that the opposite was true . Playing the other crew members are James Doohan, as Montgomery Scott, the chief engineer; George Takei, as Hikaru Sulu, Enterprise's helmsman; Walter Koenig, as Pavel Chekov, navigation and acting science officer; and Nichelle Nichols, as Uhura, the ship's communications officer . Nichols had always insisted on wearing a skirt; although the standard female uniform used trousers, the costume designer created a skirted version specifically for her . Takei was dismayed to hear that his character was called "Tiny" by a guard at McCoy's cell during the film, and argued with the film's producer to have the line cut . When Takei saw the first screening of the film, he changed his mind and promptly apologized . He would later admit in his To the Stars: The Autobiography of George Takei that "without that snipe from (the guard), the scene (where Sulu eventually beats up that same guard) would not have played even half as heroically for Sulu ." </P>

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