Following Kirk’s encounter with Khan that left the Enterprise severely damaged and Spock dead, they return to Starfleet so that Enterprise could be repaired. Kirk’s hoping to go back to the newly-created Genesis planet where he laid Spock to rest. But upon arriving, he is told that the Enterprise will not be repaired and that Genesis has become a delicate matter and until it is resolved, no one is allowed to go there or talk about it. McCoy is also acting strangely and is later detained when he starts talking about Genesis. Kirk is visited by Spock’s father Sarek, who tells him that he betrayed Spock because being placed on Genesis was not what he would have wanted. He tells Kirk he is supposed to bring Spock’s body along with his soul or katra as the Vulcans call it which he passes onto someone, and bring it to Vulcan for the final rites. Sarek assumes Kirk would have it but he does not. Kirk then thinks that Spock may have passed it someone else and realizes McCoy is the one who has..
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