I am a Star Trek fan and have been since they first were on but there definitely were some bad ones.
I can’t recall the titles but the one where Kirk was stuck on a duplicate Enterprise and the planet was overpopulated. Absolutely awful
The one where the enemies were identical except one was black and white and the other was white and black. Sort of hit you over the head with that one.
If I were to see a list I could come up with others but those will do for a start.
Yes, that overpopulation one was pretty bad.
Now for some of the favorites...
Gotta love Landru!
The overpopulation episode was “The Mark of Gideon”. The half=black half-white episode was” Let This Be Your Last Battlefield “, co-starring the late, great Frank Gorshin.