Twas the Nut Before Christmas

King of the Hill is an American animated television series that aired on Fox. The series was originally broadcast from January 12, 1997, to May 6, 2010.

The majority of episodes in this season are leftover episodes from the 9ABE production line, as well as one episode from the 8ABE production line ("Bystand Me"). The AABE production line is a short-lived line and only lasts for five episodes (four airing this season and the fifth airing as a leftover episode next season).

Beginning with the episode "Lucky See, Monkey Do", King of the Hill started being produced in 720p high-definition. This was also the final season of King of the Hill. 20th Century Fox Television initially ordered 13 DABE production episodes, but decided to keep the show in production for six additional episodes (DABE12–DABE17). However, the network only aired the last two of those six episodes (13 total for that production season), and confirmed it would not air the remaining four unaired episodes (DABE13–DABE16) in prime time, opting instead for syndication. These episodes premiered between May 3 and May 6, 2010, on local stations and premiered on Cartoon Network's Adult Swim line-up between May 17 and May 20, 2010.

...
Wikipedia