Speaking of parallel earth episodes, I quite like "Patterns Of Force".
The idea of calling the Nazi form of government the most efficient is bad but going beyond that, I like the story.
It's funny, at first, I didn't rationalize why but one of the things I like most about the episode is the character of Daras.
To me, she stands out because she's not there to be sexy or have a crush on anyone. She's an undercover operative and a leader of the Ekosian resistance, a role which was a refreshing change from the norm for women in TOS.
And one of my all time favorite little moments in TOS is the wonder Daras shows when she sees Dr. McCoy appear out of thin air and it sinks into her that these people are truly aliens from outer space.
I find it interesting that the very previous episode produced, "Return To Tomorrow", also had a female character who wasn't necessarily there to be sexy or have a chrush, Ann Mulhall.
Yes, she wore the mini skirt uniform but Diana Muldaur didn't play the character as sexy and didn't have a crush on Kirk.
I don't claim to be any paragon of virtue on women's rights but without actually thinking about it at the time, I liked both Daras and Mulhall precisely because they weren't played sexy.
I also like RTT for a couple of other reasons. It's one of the few episodes where the Enterprise is truly exploring unknown space, if I recall right, at the beginning Spock says they're hundreds of light years beyond where any Earth ship has gone. Interesting that he would say Earth and not federation ship at this late point in the series. But the ship being in unknown space always gives me a sense of mystery and wonder.
and Nimoy is absolutely awesome as Hanoch. When he starts his reign of terror on the bridge, stepping down to the captain's chair after torturing the screaming Uhura, I truly get the sense that the gates of hell have been swung wide open to let the denizens run amok.
@Hanoch, how do you like THAT assessment?
Robert