Ironically, what bothers me about "Spock's Brain" is that Kirk casually sentences the population of the planet to almost certain death. The female residents are accustomed to a civilized environment, and he tells them that they have to go up top and live like cave people. Here's an exercise... take 100 random 21st century urban females: secretaries, hostesses, lawyers, medical techs, whatever. Turn them loose in the African wilderness or Australian outback or the Frozen north with no survival training or equipment. Come back in a year and see how many are still standing.