"That Which Survives" is the seventeenth episode of the third season of the American science fiction television series Star Trek. Written by John Meredyth Lucas (based on a story by D.C. Fontana under the pseudonym Michael Richards) and directed by Herb Wallerstein, it was first broadcast January 24, 1969. In the episode, the crew of the Enterprise visit an abandoned planet guarded by a mysterious woman. Plot The Enterprise discovers a planet whose young age is inconsistent with its atmosphere and biology. As Captain Kirk, Dr. McCoy, Lt. Sulu and geologist D'Amato beam down, a woman appears in the transporter room, touches the transporter technician, and kills him instantly. As the landing party materializes, the surface of the planet is rocked by a violent tremor. Communication with the Enterprise is lost, leaving them stranded. At the same time, the Enterprise finds itself 990.7 light years from the planet. First Officer Spock orders the Enterprise back to the planet. Dr. M'Benga determines the cause of the transporter officer's death to be cellular disruption. The landing party splits up and explores their surroundings. As D'Amato surveys a rocky area, he comes face-to-face with the woman who appeared in the transporter room. After listing off his name and professional record, she says, "I am for you," and touches D'Amato, killing him. A failed attempt to cut a grave for D'Amato proves that the planet is artificial. Chief Engineer Scott, sensing something wrong, orders Engineer Watkins to check equipment in a secluded area. The mysterious woman appears, kills Watkins, and disappears again. The woman appears to Sulu and attempts to touch him, but only brushes his shoulder with her fingertips. Sulu's screams of pain bring Kirk and McCoy, who find him injured but alive. The woman touches Kirk's shoulder without effect. She then disappears. They conclude that she can only kill the person she specifically names. The ship begins to accelerate uncontrollably, and Scott discovers the emergency overload bypass has been sabotaged. Scott estimates that the ship will explode in 15 minutes if not brought back under control. Spock suggests manually cutting the matter-antimatter fuel flow to the warp engines. Scott begins the procedure as the Enterprise passes warp 13.2. Scott stops the matter–antimatter flow at the last second, just as the ship hit warp 14.1 and the ship continues its course to the planet. On the planet, the woman appears again, announcing she