Which episode aired later, Simpsons Already Did It or Professor Chaos?
Simpsons Already Did It: "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. Simpsons Already Did It:  It originally aired on Comedy Central in the United States on June 26, 2002. Professor Chaos:  It originally aired on April 10, 2002.
Simpsons Already Did It