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 Robert Brown Lazarus, Anti-Lazarus Guest Star Janet MacLachlan Charlene Masters Guest Star Richard Derr Barstow Guest Star Arch Whiting Assistant engineer Guest Star Eddie Paskey Leslie Guest Star Bill Blackburn Hadley Guest Star Frank da Vinci Brent Guest Star Thomas L. Lupo Security guard Guest Star Vince Calenti Security lieutenant Guest Star Gene Roddenberry Executive Producer Don Ingalls Writer Gerd Oswald Director