I'll go aganist everyone else and sya that the lights of zetar is the worst. I find most of the others to at least be amusing, but this is hard to sit through for me.
oddly, I like Let That Be Your Last Battlefield. this episode introduced the self destruct sequence that was used in Star Trek III. and had a good ending.
"Now all that matters is their hate"
"Do you think that's all they had sir?"
"No.....but that's all they have left."