By the third season the series had already been cancelled, and budgets cut. Many of those scripts were clearly written to take advantage of existing sets and costumes. Aside from OK Corral World, there was Nazi World, Roman World, 20s Gangster World, and a time travel trip to the Depression. Some like the last two were pretty good, the first two should have been on your list.
Yep, that episode with Chicago mobsters was pretty crazy.
"A Piece of the Action". One of the funnest Star Trek episodes...
Check out these 3 books, ‘These are the Voyages’, Year One, Year Two, and Year Three.
They detail the making of every episode, started with the assignment of scripts to the writers, and showing all the memos back and forth as the episode went into production.
By Year Three they had about a buck 98 for each episode and were pretty much being actively sabotaged.
No, the travel back to the depression was City on the Edge of Forever..1st or 2nd season. One of the best episodes and