The Enterprise's sensor readings indicate a planet unsuitable for any carbon-based life at the level of a developed civilization. Suddenly they get an apparition in space from someone who looks like and claims to be Abraham Lincoln. He insists on them checking him out and coming over to a small part on the planet surface (which has suddenly developed a perfect atmosphere for humans). He is received with full presidential honors and Kirk and Spock agree to beam down with him, but as they do, phasers and tricorders fail to dematerialize with them, and communicators won't work. There they meet Surak, the greatest Vulcan of all time, equally convincing. The quartet is greeted by a creature consisting of molten rock who presents them to notorious historical villains Ghengis Khan, Colonel Green, Zora and the Klingon Kahless the Unforgettable. They're told the teams represent good versus evil and must battle to the death against each other to teach the creature their concept. When Kirk ... Written by
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The characters of Zora and Genghis Khan have no lines. This is probably due to budget constraints, as actors with speaking parts were paid significantly more than background actors. See more
Star Trek The Original Series was notoriously inconsistent in its clues as to when it takes place. This one contains two contradictory statements within itself. Early on, Scotty says that Abraham Lincoln
has been dead for 3 centuries, suggesting that they are in the middle of the 22nd century. Later, Colonel Phillip Green is said to be from the 21st century and that his treachery happened "centuries ago." The plural reference to centuries since the 21st suggests they're past the 22nd and into at least the 23rd. See more
President Lincoln, indeed! No doubt to be followed by Louis of France and Robert the Bruce!
If so, we'll execute appropriate honors to each, Mr. Scott.