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The Enterprise discovers a seemingly abandoned spaceship that proves to be an Earth vessel dating from the late 20th century in this episode of the original Star Trek series. A search of the ship reveals several crew members in suspended animation, whom Captain Kirk and the others proceed to reanimate. Unluckily for the Enterprise, these inhabitants prove to be the only survivors of a group of power-hungry, genetically engineered superhumans who had once led a violent attempt to take over the Earth. Soon, under the guidance of their ruthless, charismatic leader Khan, they have seized control of the Enterprise, as the first step towards universal domination. The character of Khan, portrayed by Ricardo Montalban, was a memorable enough villain to be resurrected years later as Kirk's driven nemesis in Star Trek II: The Wrath of Khan(1982).