Holy Madness
I have been a huge fan of the Madness Combat series since Redeemer, and it shocks me how after four movies you keep the fights imaginative and fun. The Madness Combat hero is the best Newgrounds hero since Pico (in fact, I may them to put his expressions on the 'Vote on this Submission' icons).
You have improved every character in the series. The Clown's iron mask is a dark accessory which looks strangely sweet with his clown hair, the zombies look gory and monster-like, and even the Pope is finally showing signs of his battles with the MC hero. Finally, the addition of close-ups during the fights add a lot to the movie.
Bottom line is Madness Combat is one of the best series in Newgrounds, and this entry improves on a formula I will never get tired of.