In 2266, upon transferring Charles Evans to the USS Enterprise, Captain Ramart supplied his dossier. (TOS: "Charlie X" ) Later that year, Spock requested full personal dossiers on Doctor Thomas Leighton, Anton Karidian, Lieutenant Kevin Riley, and Captain James T. Kirk from the Enterprise's library computer, in an attempt to find correlations between them. This analysis revealed that Leighton, Riley, and Kirk were all survivors of the Tarsus IV colony massacre, and that Karidian's known history began shortly after Kodos the executioner's disappearance. (TOS: "The Conscience of the King" )