William Shatner Admiral/Captain James T. Kirk Catherine Hicks Dr. Gillian Taylor Leonard Nimoy Captain Spock DeForest Kelley Dr. Leonard McCoy James Doohan Montgomery Scott Walter Koenig Cmdr. Pavel Chekov Nichelle Nichols Cmdr. Uhura George Takei Cmdr. Hikaru Sulu Robert Ellenstein Federation Council President Brock Peters Admiral Cartwright Mark Lenard Ambassador Sarek Jane Wyatt Amanda John Schuck Klingon Ambassador Robin Curtis Lt. Saavik Kirk R. Thatcher Punk on Bus Michael Berryman Starfleet Display Officer Madge Sinclair Saratoga Captain (uncredited) Grace Lee Whitney Commander Rand Jane Wiedlin Alien Communications Officer Vijay Amritraj Starship Captain Majel Barrett Commander Chapel