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The Enterprise plays host to a number of interplanetary diplomats in preparation for a major galactic meeting in Star Trek 44: Journey to Babel, an episode from the second season of the well-known science fiction series. Amongst the guests are Sarek, the ambassador to the planet Vulcan -- who also happens to be Spock's estranged father. Despite the best efforts of Spock's mother, Spock and Sarek's differences remain irreconcilable. The distance between them grows when several of the other delegates are killed by an unknown assailant, and Spock names Sarek as the most likely suspect. The true test of family loyalties comes, however, when Sarek falls severely ill, requiring a donation of Spock's blood. Almost immediately thereafter, Captain Kirk is wounded by the killer, leaving Spock in command of the Enterprise and forcing him to choose between his duty to his father and his duty to the Enterprise.