
A surprise visit from Spock's father provides a startling revelation: McCoy is harboring Spock's living essence.
Cast

William Shatner
Admiral James T. Kirk

DeForest Kelley
Dr. Leonard 'Bones' McCoy

James Doohan
Captain Montgomery 'Scotty' Scott

George Takei
Cmdr. Hikaru Sulu

Walter Koenig
Cmdr. Pavel Chekov

Nichelle Nichols
Cmdr. Uhura

Christopher Lloyd
Cmdr. Kruge

Robin Curtis
Lt. Saavik

Mark Lenard
Ambassador Sarek

Merritt Butrick
Dr. David Marcus

Judith Anderson
Vulcan High Priestess

James B. Sikking
Captain Styles

Phillip R. Allen
Capt. Esteban

Robert Hooks
Admiral Morrow

John Larroquette
Maltz

Carl Steven
Spock...Age 9
Vadia Potenza
Spock...Age 13

Stephen Manley
Spock...Age 17
Joe W. Davis
Spock at age 25

Leonard Nimoy
Captain Spock / Elevator Voice

Miguel Ferrer
First Officer

Branscombe Richmond
Klingon Gunner #2

Frank Welker
Spock's Screams

Scott McGinnis
Starfleet Cadet "Mr. Adventure"

Phil Morris
Trainee Foster

Jeanne Mori
Helm Officer

Grace Lee Whitney
Commander Janice Rand (Woman in Cafeteria)
Nanci Rogers
Bar Waitress (uncredited)
Paul Sorensen
Captain

Danny Rogers
Merchantman First Officer (uncredited)
Crew

Leonard Nimoy
Director

Harve Bennett
Writer, Producer
Robert F. Shugrue
Editor
Charles Correll
Director of Photography
John Hockridge
First Assistant Director
Gary Nardino
Executive Producer

Ralph Winter
Associate Producer
Elza Bergeron
Casting
Mary Ann Barton
Casting
Stuart Jensen
Casting
Robert Fletcher
Costume Design
Silvia Abascal
Hairstylist
Rick Stratton
Makeup Artist
Jim Kail
Makeup Artist
Wes Dawn
Makeup Artist
James Lee McCoy
Makeup Artist
Cecelia Hall
Supervising Sound Editor
Ray West
Sound Re-Recording Mixer
Robert W. Glass Jr.
Sound Re-Recording Mixer
David J. Hudson
Sound Re-Recording Mixer

Alan Howarth
Sound Effects
Bob Dawson
Special Effects
Steve LaPorte
Special Effects Makeup Artist

Tom Woodruff Jr.
Special Effects Makeup Artist

Ken Ralston
Visual Effects Supervisor

James Horner
Original Music Composer
Tom Pedigo
Set Decoration
Steve Blalock
Stunts
Ernest Robinson
Stunts
David Burton
Stunts

Kenny Endoso
Stunts

Chuck Hicks
Stunts
Jean Coulter
Stunts
Alan Oliney
Stunts

Danny Rogers
Stunts
Phil Chong
Stunts
Jeff Jensen
Stunts
James M. Halty
Stunts

Tom Morga
Stunts

Chuck Picerni Jr.
Stunts
Don C. McGovern
Stunts
Frank James Sparks
Stunts

Eddy Donno
Stunts

R.A. Rondell
Stunt Coordinator

Ron Stein
Stunt Coordinator

John C. Meier
Stunt Double
Al Jones
Stunt Double

Gene Roddenberry
Original Series Creator
John E. Chilberg II
Art Direction
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