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
