Star Trek: The Next Generation: Unnatural Selection

"Unnatural Selection" is the seventh episode of season two of the American science fiction television series Star Trek: The Next Generation and the twenty-ninth episode of the series overall (if one counts the two-part pilot episode "Encounter at Farpoint" as two episodes). Combining the episode count of all Star Trek-related TV shows to date, it is the 135th episode of the entire franchise. The episode was directed by Robert Becker with a teleplay written by Burton Armus based on a story treatment by Les Menchen, Lance Dickson, and David Landsberg. It first aired in syndication on Saturday, January 28th, 1989.