???
As far as televised content goes, they only have ten appearances across the entire franchise, and six of those were just brief cameos with less than a minute screentime per episode. Of the remaining four, they only had a meaningful part of the plot for three if them, Smith and Jones, Fugitive of the Judoon and SJA's Prisoner of the Judoon.
I think that's kind of the point -- that they're pretty much a one-joke species (or two jokes, the authoritarian policing and the language with only one vowel), so it didn't take long to wear out their potential.
Although, I dunno, you could maybe have something if a story took them seriously as an allegory for police abuse of power, law & order as an excuse for fascism, etc.