Claim: Dances with Smurfs, episode 13 of season 13, was written and directed by Trey Parker, who is known for co-creating South Park.
Evidence: "Dances with Smurfs" is the thirteenth episode of the thirteenth season of the American animated television series South Park. The episode was written and directed by series co-creator Trey Parker, and was rated TV-MA L in the United States and M (as) in Australia. He is known for co-creating South Park (1997–present) and co-developing The Book of Mormon (2011) with his creative partner Matt Stone. 
Season 13
Episode 13 Trey Parker Trey Parker He is known for co-creating South Park (1997–present) and co-developing The Book of Mormon (2011) with his creative partner Matt Stone.