The twelfth season of South Park, an American animated television series created by Trey Parker and Matt Stone, began airing on March 12, 2008. The twelfth season concluded after 14 episodes on November 19, 2008. Saturday Night Live cast member Bill Hader is credited as a consultant starting with this season. Parker was the director and writer in this twelfth season. Stone was also the writer on the third episode of the twelfth season.