The epic return of Matt Groening.
And for that matter, Satan, I suppose. This episode was one of the best I've seen in a while, the opening to this episode was quite possibly the most epic of all of the RAB movies up to this point, it was pretty... unexpected, I suppose.
The only thing wrong with this episode is that it could have done with a few more jokes, but the storyline behind it made up for that, I guess.
Now I'm sorely tempted to buy the long-lost RAB 9, which I've considered for years.
Good job, can't wait to see how long this series grows to be before it just.. well, stops. :(