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 Walter Koenig Ensign Pavel Chekov Actor Elizabeth Rogers Lt. Palmer Guest Star John Winston Lt. Kyle Guest Star Majel Roddenberry Nurse Christine Chapel Guest Star Jay D. Jones Ensign Mallory Guest Star Eddie Paskey Leslie Guest Star Bobby Bass Chekov's Guard 1 Guest Star Bart La Rue Provider 1 Guest Voice Paul Baxley Vaalian 1 Guest Star Bob Orrison Engineer Guest Star Bobby Clark Chekov's Guard 2 Guest Star Walker Edmiston Vulcan Space Central Guest Voice Bill Blackburn Hadley, Vaalian 2 Guest Star David L. Ross Galloway Guest Star Gene Roddenberry Executive Producer, Writer Gene L. Coon Writer D.C. Fontana Writer Robert Bloch Writer John Meredyth Lucas Writer, Director David P Harmon Writer Art Wallace Writer Jerome Bixby Writer Stephen Kandel Writer Norman Spinrad Writer Theodore Sturgeon Writer Joseph Pevney Director Ralph Senensky Director David Gerrold Writer Vincent McEveety Director Max Ehrlich Writer Gilbert Ralston Writer Marc Daniels Director