Stardate 41463.9: The Enterprise arrives to check up on a terraforming station, where the researchers and the visiting Away Team are unaware that the unseen killer in their midst is an intelligence whose existence is threatened by the changes to be effected on the planet.
teleplay by Robert Sabaroff
story by Karl Guers, Ralph Sanchez and Robert Sabaroff
directed by Corey Allen
music by Dennis McCarthy
Guest Cast: Walter Gotell (Mandl), Elizabeth Lindsey (Louisa Kim), Gerard Pendergrast (Bjorn Bensen), Mario Roccuzzo (Arthur Malencon), Carolyne Barry (Female Engineer)
LogBook entry by Earl Green