Often involving Greek/Roman mythology.
I mean, seriously, the Star Trek writers loved that stuff. Like half the starships in the fleet had Greek/Roman names. And The Romulans? Hello??? And then there were episodes like Bread and Circuses. And Who Mourns For Adonais. And… well, ok that’s all I can actually think of. But there’s this:
So it wasn’t actually an episode. It should have been. Like you wouldn’t have killed to see Shatner hamming it up while fighting a guy in a giant cyclops costume.
Oh man! Is this a Richard Corben Star Trek cover!?
I thought the same thing initially, but I don’t think it is.