Despite triumphing over the evil Khan, Admiral Kirk's victory is a hollow one -- McCoy (DeForest Kelley) is going insane, and Spock (Leonard Nimoy) is dead. Or is he? Kirk (William Shatner) jeopardizes his career by commandeering the U.S.S. Enterprise for a mission to the Genesis Planet. If he and his aging crew can defeat a deadly crew of Klingons, they may just be able to rescue their absent friend.