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In 2266, Spock requested full personal dossiers on Doctor Thomas Leighton, Anton Karidian, Lieutenant Kevin Riley and Captain James T. Kirk from the USS Enterprise library computer, in an attempt to find correlations between them. This analysis revealed that Leighton, Riley, and Kirk were all survivors of the Tarsas IV colony massacres, and Karidian's history began shortly after Kodos the executioner's disappearance. (TOS: "The Conscience of the King")