This ep asks you to leave your brain at the door, which I guess is only appropriate, since it takes place at a sanitarium. One of the doctors has developed a brain surgery which restores even the most violent patients into happy, well-adjusted members of society. The pace is too slow from the start; it's immediately apparent from the dialogue's many variations of "What a wondrous cure for mental patients the benevolent Dr. Moreau has created!" there's something rotten in a back room, but the episode takes 13 minutes to get to that point.
The secret is Dr. Moreau's surgery also makes the patients susceptible to mind control, and he plans to sell the procedure to the highest bidder. David makes off with a videotape of evidence, but realizing he's about to be caught, he chucks it under a bush.
Here's where the episode loses all credibility. Moreau and his henchmen inexplicably cannot find the tape. Whenever they ask "Where did you hide that tape, David?", I wanted to shout "Did it occur to you to check the place where you found him, geniuses?" But the stupidity gets much worse: they plan to use Moreau's surgery on David. When Moreau tells Dr. Hill this, she shrugs, as if performing experimental brain surgery without the permission of the patient or his next of kin were something doctors do every day instead of a guaranteed ticket to prison.
A lot of drama is built around the hidden tape, so I guess the writers were shooting for an award for Most Anticlimactic Resolution, because not only does Moreau get the tape in the end, but it turns out he was going to show it to Dr. Hill anyway. Which also makes no sense, because all showing her the tape does is introduce the risk of her turning against him. Still, the mental patients are fun, so the episode isn't a *total* loss.