TOS #9: Dagger of the Mind

Second episode in a row with a crazy doctor run amok, but this one is a possible precursor to the "There are Four Lights" TNG episode.

This episode has a little Zach-in-the-box action...

...But is really a fascinating exploration of psychotherapy. All the "rehabilitated" people that I saw kept reminding me of the post-treatment scenes in "A Clockwork Orange."

Kirk: "One of the advantages of being a Captain, Doctor, is being able to ask for advice without necessarily having to take it."

Then the dude tries to use the neuralizer to erase Kirk's mind. Naturally, he is unsuccessful.