William Shatner
Admiral James T. Kirk
Acting
DeForest Kelley
Dr. Leonard 'Bones' McCoy
Acting
James Doohan
Captain Montgomery 'Scotty' Scott
Acting
George Takei
Cmdr. Hikaru Sulu
Acting
Walter Koenig
Cmdr. Pavel Chekov
Acting
Nichelle Nichols
Cmdr. Uhura
Acting
Christopher Lloyd
Cmdr. Kruge
Acting
Robin Curtis
Lt. Saavik
Acting
Mark Lenard
Ambassador Sarek
Acting
Merritt Butrick
Dr. David Marcus
Acting
Judith Anderson
Vulcan High Priestess
Acting
James B. Sikking
Captain Styles
Acting
Phillip R. Allen
Capt. Esteban
Acting
Robert Hooks
Admiral Morrow
Acting
John Larroquette
Maltz
Acting
Carl Steven
Spock...Age 9
Acting
Vadia Potenza
Spock...Age 13
Acting
Stephen Manley
Spock...Age 17
Acting
Joe W. Davis
Spock at age 25
Acting
Leonard Nimoy
Captain Spock / Elevator Voice
Acting
Miguel Ferrer
First Officer
Acting
Branscombe Richmond
Klingon Gunner #2
Acting
Frank Welker
Spock's Screams
Acting
Scott McGinnis
Starfleet Cadet "Mr. Adventure"
Acting
Phil Morris
Trainee Foster
Acting
Jeanne Mori
Helm Officer
Acting
Grace Lee Whitney
Commander Janice Rand (Woman in Cafeteria)
Acting
Nanci Rogers
Bar Waitress (uncredited)
Acting
Paul Sorensen
Captain
Acting
Danny Rogers
Merchantman First Officer (uncredited)
Crew