The crew returns to the planet from TOS's "Shore Leave" — where a supercomputer can create a robot-populated fantasy realm based on reading your thoughts and creating whatever you want — to take some, well, shore leave, in a story that might as well be called "Shore Leave II." What starts as a relaxing time of sitting by the lake and enjoying the fresh air quickly turns into another example of your thoughts transforming into your enemies because the machines have decided to run amok.
After being attacked by the queen's army from Alice in Wonderland, McCoy beams up to report the malfunctions. Uhura is kidnapped by the supercomputer and held captive while the computer makes TOS-style computer misunderstandings (like believing Uhura is a slave to the "sky machine" because it thinks the Enterprise controls its crew instead of vice-versa) and decides it wants to grow beyond its servile existence of creating fantasy worlds for the pleasure of visitors.
In their attempt to rescue Uhura, Kirk and the team must work through the obstacles of the fantasy realm, including pterodactyls, a two-headed dragon, and a giant cat. This story unfortunately doesn't have an example of Kirk Outsmarts the Computer™, unless you count the (somewhat convoluted) plan where Spock takes some drugs to simulate illness so the computer's rescue drones will open the fake mountain which will allow Kirk access to the control room.
Meanwhile, Scotty must deal with the supercomputer's attempts to take over the Enterprise by hacking the ship's computer — resulting in the gravity being turned off and other inconveniences.
At the heart of this story, I guess, is the question around artificial intelligence and what happens when a computer decides to take matters into its own hands while applying logic based on incorrect assumptions. I wish the story had spent more time on that dialogue rather than all the action with Kirk & Co. interacting with the fantasy realm, which consistently fails because the animation is so bad. The story here is solved very quickly with one conversation of convenient persuasion, where Kirk and Spock appeal to the computer's logic and it agrees to all their terms.
But only on TAS: The hilariously goofy final shot of the no-longer-in-jeopardy crew members sitting on a picnic blanket with the two-headed dragon. Bonus points for that.
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