Limburger hires a cowboy called Corroder Cody and his car Rusty to help him "spill" oil from the local refineries. But with the help of a mysterious biker, the mice are going to clean up this cowboy's act.Chicago and the mice face a huge problem when Limburger disappears and a couple of monsters named Gorgonzola and Monsterella decide to do some tromping and stomping. Needing to get Limburger back, Charlie has to fix the transporter, but how is she going to save the mice from being the monsters appetizers?
