In it; Cartman, Stan and Kyle are tired of having Butters as their 4th best friend so they dump him and hold a Bachelor - style contest to find their new replacement for the late Kenny. Meanwhile Butters, dejected after his rejection, creates a new alter - ego; Professor Chaos who is the new villain of South Park.
During the period where Kenny was killed and Butters the pansy took his place; it was becoming evident that no episode will ever be the same quality without him while this episode is firm proof to the opposite. The send - up of the Bachelor show is side - splitting in itself but you're also keen to see it all unravel as their decision will have a semi - permanent effect on the show. The Butter/Professor Chaos sub - plot takes a little while to find it's feet but once he sets out on a doomed mission to destroy the world; you'll need a tow truck to get you away from the screen.
This episode is also one of our last chances to see Pip as a main character as he's gone by the next season and what seems like a take on TV cliffhangers actually sees one recurring character killed off forever. It just goes to show how the ever - expanding development of the four boys is taking its toll on the appearences of the side characters. The episode looks and sounds terrific and this time pistol - slinging Matt Stone delivers the best performance of the episode with a superb vocal routine as Butters.
Professor Chaos is a classic example of how good South Park can be; it's a winner on all counts.