The plot follows the character of Leviticus Clay, a young man who discovers a hidden door in a public restroom that allows him to use the facilities for free. He becomes embroiled in a world of rebellion against the tyrannical Mr. Shrek, who controls the Urinetown empire.
What makes the script work is its deadpan commitment to this absurd premise. The characters treat the "pee tax" with the same gravity we would treat a housing crisis or healthcare debt. The villain, Caldwell B. Cladwell (a name dripping with satirical contempt for corporate greed), delivers his villain song, "Don’t Be the Bunny," not as a cackling cartoon, but as a reasonable business lecture. This tonal tightrope—treating the ridiculous as mundane—is where the satire lands hardest.