"A surprise visit from Spock's father provides a startling revelation: McCoy is harboring Spock's living essence."
William Shatner
as Admiral James T. Kirk
DeForest Kelley
as Dr. Leonard 'Bones' McCoy
James Doohan
as Captain Montgomery 'Scotty' Scott
George Takei
as Cmdr. Hikaru Sulu
Walter Koenig
as Cmdr. Pavel Chekov
Nichelle Nichols
as Cmdr. Uhura
Christopher Lloyd
as Cmdr. Kruge
Robin Curtis
as Lt. Saavik
Mark Lenard
as Ambassador Sarek
Merritt Butrick
as Dr. David Marcus
Judith Anderson
as Vulcan High Priestess
James B. Sikking
as Captain Styles
Phillip R. Allen
as Capt. Esteban
Robert Hooks
as Admiral Morrow
John Larroquette
as Maltz
Carl Steven
as Spock...Age 9
Vadia Potenza
as Spock...Age 13
Stephen Manley
as Spock...Age 17
Joe W. Davis
as Spock at age 25
Leonard Nimoy
as Captain Spock / Elevator Voice
Miguel Ferrer
as First Officer
Branscombe Richmond
as Klingon Gunner #2
Frank Welker
as Spock's Screams
Scott McGinnis
as Starfleet Cadet "Mr. Adventure"
Phil Morris
as Trainee Foster
Jeanne Mori
as Helm Officer
Grace Lee Whitney
as Commander Janice Rand (Woman in Cafeteria)
Nanci Rogers
as Bar Waitress (uncredited)
Paul Sorensen
as Captain
Danny Rogers
as Merchantman First Officer (uncredited)
Charles Correll
Director of Photography
Tom Pedigo
Set Decoration
Elza Bergeron
Casting
James Horner
Original Music Composer
Robert F. Shugrue
Editor
Mary Ann Barton
Director
Robert Fletcher
Costume Design
John E. Chilberg II
Art Direction
Harve Bennett
Producer
Stuart Jensen
Writer
Ralph Winter
Associate Producer
Gary Nardino
Executive Producer
Rick Stratton
Makeup Artist
Silvia Abascal
Hairstylist
Jim Kail
Wes Dawn
Ray West
Sound Re-Recording Mixer
Steve Blalock
Stunts
Ernest Robinson
Robert W. Glass Jr.
Alan Howarth
Sound Effects
David Burton
Kenny Endoso
Chuck Hicks
Bob Dawson
Special Effects
Steve LaPorte
Special Effects Makeup Artist
Jean Coulter
Cecelia Hall
Supervising Sound Editor
R.A. Rondell
Stunt Coordinator
Alan Oliney
Phil Chong
Jeff Jensen
James M. Halty
Tom Morga
Chuck Picerni Jr.
Ron Stein
John Hockridge
First Assistant Director
James Lee McCoy
Tom Woodruff Jr.
David J. Hudson
John C. Meier
Stunt Double
Don C. McGovern
Frank James Sparks
Al Jones
Eddy Donno
Ken Ralston
Visual Effects Supervisor
Gene Roddenberry
Original Series Creator