Mooooving Day is the twenty-second episode of Season 5.
While Timmy is getting ready for a belching contest, he notices that his mother is having no luck with her job in real-estate. Timmy wishes that his mother could sell houses, and soon enough she has sold everyone's houses, including the Turners' themselves, moving them into luxurious Dimmadome Acres. Everything seems well in Dimmadome Acres until Timmy notices that everyone who has been drinking the milk is acting all weird. This means it is everyone but him (due to his practicing for the belching contest by drinking strictly soda) has suddenly been put into a trance-like state, even Cosmo and Wanda have become hypnotized! Timmy must now find a way to free everyone from the milk's influence.
This synopsis needs improvement.
Timmy is getting ready for the belch contest when he finds out that his mom hasn't sold a single house in days. Wanda puts a charm on her that will allow her to sell any house she touches. Mom does well until Timmy and his dad find out that she has sold their house as well, and they are going to move to Dimmadome Acres.
Timmy, Cosmo, Wanda, and his parents then move to Dimmadome Acres, where the neighborhood is fancy, but everyone is somewhat obsessed with the milk there. Timmy notices that everyone is suddenly in some sort of trance after drinking the milk. In a zombified way, the citizens of Dimmadome Acres along with Chester, A.J., Mr. Crocker, Vicky, and Bucky (who have all moved there as well) pursue Timmy, trying to turn him into one of them. Timmy's parents and even his godparents are about to capture him, when Timmy discovers an underground dairy factory and enters. He finds out that the mastermind behind all of this is Doug Dimmadome.
Doug Dimmadome explains that with the milk and the moving he can earn more cash, which is the scheme he's been pulling. Just as his zombies are about to capture Timmy, Timmy throws his soda bottle at the milk. It makes a combination of milk and soda and restores the land back but all the houses are gone (the soda was poofed up by Cosmo, making it magical). Dimmadome is taken away on a bulldozer. Now that everyone is back to themselves, they all move back to Dimmsdale thanks to Mrs. Turner. Timmy competes in the Big Burp-off against Chompy the Goat and wins.