For the World is Hollow and I Have Touched the Sky
A great title. A great scene where the old man makes this declaration right before he crumples and dies. The rest of it very choppy as though lines of dialog were edited out. McCoy's motivation to stay behind makes little sense. Evil computers enslaving people in ignorance.. kind of familiar. And the big piece missing..where was the asteroid ship headed? What was their promised land? How were they going to get out of the asteroid and how was it going to land?
I offer explanations to a lot of these questions in my novel Ex Machina.
Plato's Stepchildren
This episode could have been saved from cheesiness if it had been Surak's Stepchildren or Kahless's Stepchildren or anything else. You could have had the same story line of aliens taking on a culture they admired and then going rogue and abandoning its tenets. So much interest could be added by making it an alien Trek culture and not a toga party.
But then it would've been a hell of a lot more expensive to make. The budget was severely slashed for the third season. Cheaper to reuse costumes, props, and set pieces left over from some previous historical production than to make a bunch of alien stuff from scratch.
Not to mention that neither Surak nor Kahless would even be created until several months after this script was written.
Did they even quote Plato once in the episode? No, it was all laurel leaves and torture.
I think that was kind of the point -- that the Platonians aspired to Plato's ideal society, but it was just a hollow facade over something far uglier.