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 John Arndt Crewman Sturgeon Guest Star Sandra Lee Gimpel M-113 Creature Guest Star Garrison True Security Guard Guest Star Larry Anthony Berkley Guest Star Jeanne Bal Nancy Crater Guest Star Alfred Ryder Professor Robert Crater Guest Star Bruce Watson Green Guest Star Michael Zaslow Darnell Guest Star Vince Howard Crewman Guest Star Francine Pyne Nancy III Guest Star Budd Albright Barnhart Guest Star Bob Baker Beauregard Guest Star Bill Blackburn Lt. Hadley Guest Star Frank da Vinci Brent Guest Star Eddie Paskey Lt. Ryan Guest Star Gene Roddenberry Executive Producer Marc Daniels Director George Clayton Johnson Writer