Homer is brainwashed into joining a cult, and the cult expands to other Springfield citizens. Marge tries to save her kids and Homer because she was never brainwashed. In the end, they are all saved, and the cult leader turns out to be a maniac who just wanted money.
This was an interesting episode on cults, and I think, for the most part, it was handled pretty nicely. It had some good jokes and an overall good plot. I can name two hilarious jokes off the top of my head. My overall grade for this episode is probably an A+