It was screwed later on. Remember, the ratings declined during the mid-to-late-2000s given that sporting events went overtime on Fox, resulting a Sunday Animation Domination schedule to be completely rough on edges with its time schedule. This explains why King of the Hill moved to other time slots before it got cancelled in 2009 for good. The show was picked for syndication for reruns on Adult Swim, which included a couple other unaired episodes.
If we're talking about 1998 animated movies (and considering Christmas is coming up)