Star Trek III: The Search for Spock

Spock is dead! The mood among his former friends is correspondingly depressed. Bones also takes the death of his dearest discussion partner to heart, but Kirk is still very surprised when he catches him in Spock's cabin and he, of all people, behaves just like the dead Vulcan. Kirk learns from Spock's father Sarek that Spock must have tried to transfer his mind into someone else before his death - into McCoy? In fact, Saavik and Kirk's son David Marcus, who have both stayed behind on the planet Genesis, find Spock's empty coffin and discover a nearby Vulcan child with no memory who is growing up rapidly...