Star Trek III: The Search for Spock
The crew of the Enterprise are still smarting after the death of Spock, some more than others; Doctor McCoy in particular exhibits signs of some kind of emotional breakdown. When ambassador Sarek arrives at Admiral Kirk's home expecting to hone in on Spock's eternal soul, his search is brought to an abrupt halt when he learns that Kirk has no clue as to what Sarek is talking about. Kirk does however discover that Spock's Katra is parked inside the brain of McCoy. Sarek presents Kirk with a mission to deliver both McCoy and Spock's body to Vulcan so that a seldom practiced ritual can be performed to restore McCoy's sanity.
Spock's father Sarek visits Kirk's apartment to protest Kirk's decision to lay Spock's body to rest on planet Genesis, in direct opposition to what Sarek believes were Spock's wishes... and what of Spock's living spirit? - Kirk is clueless as to what Sarek is talking about but agrees to submit his thoughts to Sarek via a Vulcan mind meld.
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