After Kirk, McCoy, Sulu and the geologist D'Amato have beamed down to a seemingly uninhabited planet, the Enterprise is hurled away almost 1000 light years. While they are left on their own on the planet, a woman first comes and kills D'Amato, then reappears and hurts Sulu. Each time this woman called Losira appears, she is capable of killing just a single specific crew member. Meanwhile on the Enterprise, the woman has killed two more of the crew and sabotaged the ship's engines to blow up. In a race against time Scott and Spock manage to repair the damage. Kirk, McCoy and Sulu find the entrance to an underground habitat, where they are facing three copies of Losira, each programmed for one of them. Spock beams down with a security officer, who disables the computer that controls Losira. It turns out that the planet is an artificially constructed Kalandan outpost, whose population died long ago because of a deadly virus that may have been spread to other colonies and erased the civilization.

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