• Air date: 08 Sep '66 29 episodes
      The first season of the original Star Trek aired Thursdays at 8:30-9:30 pm on NBC from September 8, 1966 to April 13, 1967.
  • List of Episodes (29)
    • 26. Errand of Mercy

      23 Mar '67
      The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates a humble planet caught in the middle - Organia, inhabited by pacifists
    • 27. The Alternative Factor

      30 Mar '67
      Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
    • 28. The City on the Edge of Forever

      06 Apr '67
      Kirk and Spock must travel into the past in order to correct a change that will alter history.
    • 29. Operation: Annihilate!

      13 Apr '67
      Kirk and the Enterprise must combat parasitic aliens.