This episode is often cited as having never aired in the U.S. during the TV show's first run, due to its plot involving gas bombs being used in warfare (the network being worried about allusions to the Vietnam War, which was still in progress at the time); the episode being pre-empted by a CBS special on December 6, 1974. However, the episode was broadcast in select cities on that Friday evening at the regular 8pm EST slot, including Rochester, New York and Providence, Rhode Island.
The working title of this episode was "The Conqueror".
This episode takes place in 3085.
The production number is B-507. While it was the thirteenth episode broadcast, it was the seventh in production order.
French title: "Libération".