 The first season (episodes 1-20) began airing on Adult Swim April 9, 2007.After a long hiatus, the last six episodes of season one (episodes 21-26) began airing December 10, 2007.Season 2 (episodes 27-52) began airing on April 12, 2008, with writers Michael B. Steinberg, Ben Arntz, Laura Moran, and Joelle Sellner added to the writing team.