Animated Sitcom In Its 13th Year...Fox is knocking "King of the Hill" of it's throne.  The long-running animated comedy, now in its 13th year, is being canceled, but will likely air during the 2009-10 season. The network recently ordered 13 new episodes, and animated series have a long production schedule. Ratings for "King of the Hill" have been relatively flat early this season. The picture is brighter for another Sunday night animated show on Fox, "American Dad," which was renewed for its fifth season. It has posted single-digit ratings gains among advertiser-favored young adult viewers and total viewers.

Source:  ap