I'm an original Trekkie. I watched it in first run. In the past 5 years I saw an original Star Trek that I had never seen before. I don't remember the episode name, remember I'm old. Spock had his brain removed and it was being used for Climate Control on a planet where the women (called "the givers of pleasure and pain") were underground and the men above ground.
So Spock was turned into a thermostat! I don't know how I missed it the first time, nor the hundreds of times it must have been played since then. Now it is my favorite because it is the newest, to me.