Episode Title: "THAT WHICH SURVIVES"
Production Number: 69
Original Air Date: 01-24-69
The U.S.S. Enterprise finds an unusual planet that has evolved an environment similar to Earth's in only a few thousand years. As Captain Kirk leads a landing party to the surface, the Enterprise is knocked 990.7 light-years away, stranding the landing party alone on the planet.
A projection of an alien woman appears on the Enterprise and kills two crewmen and sabotages the warp engines, and a projection of the same woman appears on the planet, attacking members of the landing party. The landing party destroys the computer controlling the projections, and learns that the planet is a Kalandan outpost, whose people all died from a disease produced when they created the planet. The computer was automatically defending the outpost from non-Kalandan intruders, using projections of Losira, the last Kalandan survivor.
Guest Characters: Dr. M'Benga
Alien Races: *[Kalandan]
KEY: [brackets]=illusions *star=first appearance