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Question: When Khan speaks to Kirk, he tells him that he wants revenge for the death of his wife. Who was Khan's wife?

Answer: Lt. Marla McGivers was the crew member.

Answer: This is a reference to the TV show episode that this movie is a distant sequel to. In that episode, one of Kirk's crew falls in love with Khan and helps him take over the ship. When Khan is exiled to the planet, she chooses to go with him. So it would be that after the catastrophic events of one of the planets in that system exploding and causing all sorts of damage to their new planet, she was killed there and Khan blames Kirk for it.

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