High Quality Content by WIKIPEDIA articles! "The Monkey Suit" is the twenty-first episode of the seventeenth season of the American animated sitcom The Simpsons. It originally aired on the Fox network in the United States on May 14, 2006. In the episode, Ned Flanders is shocked after seeing a new display at the museum about evolution. Together with Reverend Lovejoy, he spreads the religious belief of creationism in Springfield, and at a later town meeting, teaching evolution is made illegal. As a result, Lisa decides to hold secret classes for people interested in evolution. However, she is quickly arrested and a trial against her is initiated.