A surprise visit from Spock's father provides a startling revelation: McCoy is harboring Spock's living essence.
as Admiral James T. Kirk
as Dr. Leonard 'Bones' McCoy
as Captain Montgomery 'Scotty' Scott
as Cmdr. Hikaru Sulu
as Cmdr. Pavel Chekov
as Cmdr. Uhura
as Cmdr. Kruge
as Lt. Saavik
as Ambassador Sarek
as Dr. David Marcus
as Vulcan High Priestess
as Captain Styles
as Capt. Esteban
as Admiral Morrow
as Maltz
as Spock...Age 9
as Spock...Age 13
as Spock...Age 17
as Spock at age 25
as Captain Spock / Elevator Voice
as First Officer
as Klingon Gunner #2
as Spock's Screams
as Starfleet Cadet "Mr. Adventure"
as Trainee Foster
as Helm Officer
as Commander Janice Rand (Woman in Cafeteria)
as Bar Waitress (uncredited)
as Captain
as Merchantman First Officer (uncredited)
