Star Trek episode "Spock's Brain"

"Spock's Brain" Season 3, episode 1.

You know, for an episode cheesily entitled "Spock's Brain" it is a really good one.

Aliens steal Spock's brain! Yet they leave his body...that's an oddity.

Scotty talks about the ion propulsion of the alien ship being advanced. "They could teach us a thing or two." The alien, an unassuming beautiful woman, transports to the Enterprise and with the touch of a couple buttons on a device on her wrist, she completely incapacitates the entire crew, even those on other decks. More super-advanced technology that gets forgotten about in Trek-time. Then she steals Spock's brain!

Kirk hunts down the aliens and finds an advanced civilization that apparently needs a strong brain to run the city. The inhabitants know nothing. The Builders of the place and their medical knowledge--who are they? Where did they come from? go? It's another one of those themes of whether or not paradise is having someone or something else do it all for you. McCoy then gets some super-knowledge and puts Spock's brain back in his head. The Federation could study and learn from that world--do they? I sometimes wonder what happens "after the episode."