Question: Which American animated television series created by Trey Parker and Matt Stone features a character called Butters who thinks up schemes to take over the world in its 86th episode?

Related documents: [0]  [DOC] "Simpsons Already Did It" is the seventh episode of the sixth season of the American animated television series "South Park", and the 86th episode of the series overall. It originally aired on Comedy Central in the United States on June 26, 2002. In the episode, which continues on from the events of the previous episode "Professor Chaos", Butters thinks up a series of schemes to take over the world, but realizes that each one has already been performed on "The Simpsons". Meanwhile, Ms. Choksondik dies and Cartman, Kyle and Stan think that they are responsible. [END] 
[1]  [DOC] Season six of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 6, 2002. The sixth season concluded after 17 episodes on December 11, 2002. This season is notable for being the only one without Kenny as a main character, as he was written off in the previous season. Kenny, however, plays a part in some episodes without appearing and returns at the conclusion of the final episode. [END]  
Answer: South Park
South Park