William Shatner Capt. James T. Kirk Actor Leonard Nimoy Mr. Spock Actor DeForest Kelley Dr. Leonard McCoy Actor James Doohan Engineer Montgomery Scott Actor Nichelle Nichols Lt. Uhura Actor George Takei Lt. Sulu Actor Grace Lee Whitney Yeoman Janice Rand Guest Star Ed McCready Boy creature Guest Star David L. Ross Security Guard 1 Guest Star Kim Darby Miri Guest Star Michael J. Pollard Jahn Guest Star Keith Taylor Boy Guest Star Kellie Flanagan Blonde girl Guest Star Stephen McEveety Redheaded boy Guest Star Jim Goodwin Farrell Guest Star John Megna Jahn's friend Guest Star Irene Sale Louise Guest Star Scott Whitney Small boy Guest Star Dawn Roddenberry Little blonde girl Guest Star Phil Morris Boy in Army helmet Guest Star Gene Roddenberry Executive Producer Adrian Spies Writer Vincent McEveety Director