Monsignor Martinez (found live-action spin-off pilot of "King of the Hill" Fox animated sitcom; 2000)
From The Lost Media Wiki
In 2000, Mike Judge was commissioned by Fox to create a live-action pilot episode based on the fictional TV show Monsignor Martinez, as seen in Judge's animated series King of the Hill.
The pilot episode (titled "In the Beginning") was produced, but Fox declined it, and as a result, it was never aired. Not much is known about the episode, besides the cast and crew credits, and the fact that it was "very funny and full of social commentary", as actor David Herman once recalled in an interview.
Some claim to have been sent VHS screener copies back in the early 2000's, but these claims are unverified, and the pilot has never shown up online.