Dr. Leonard McCoy (DeForest Kelley) had great moments throughout Star Trek: The Original Series, but this season 3 episode was his best. The third member of Star Trek's most famous trio, Dr. McCoy was not the central focus of as many episodes as Captain James T. Kirk (William Shatner) and Mr. Spock (Leonard Nimoy). As the Chief Medical Officer aboard the USS Enterprise with a questionable bedside manner, Dr. McCoy's temperament led to some of Star Trek's funniest moments, as the cantankerous doctor perfectly complemented Kirk and Spock.
DeForest Kelley never failed to deliver a solid performance in Star Trek, and McCoy remains one of television's best doctors. Dr. McCoy's best moments are spread throughout Star Trek: The Original Series, but Bones' best overall episode doesn't come until season 3. Although Star Trek's third season is generally regarded as its weakest, it had its moments, despite its reduced per-episode budget and Friday night timeslot. TOS season 3 delivered some truly unique aliens and science fiction concepts, including this episode featuring a generation ship disguised as an asteroid.
McCoy's Best Episode In Star Trek: The Original Series Was "For The World Is Hollow And I Have Touched The Sky"
McCoy Shines In Star Trek: The Original Series Season 3, Episode 8
When "For The World Is Hollow And I Have Touched The Sky" begins, Dr. Leonard "Bones" McCoy discovers that he has contracted a fatal disease known as xenopolycythemia and has only one year to live. This tragic news informs the rest of McCoy's decisions throughout the Star Trek season 3 episode, and DeForest Kelley perfectly plays McCoy's understated fear and sadness. When the Enterprise encounters a ship disguised as an asteroid, Kirk, Spock, and McCoy beam aboard to find a society of people convinced they live on a planet called Yonada.