A class visit to the Gross-Me-Out exhibit at the science museum inspires Stink Moody to create a variety of terrible smells to put on the sneakers he plans to enter in the World's Worst Super-Stinky Sneaker contest.

Judy's brother Stink, who desperately wants it to snow for Christmas, gets his wish when a new mailman, who knows a lot about weather patterns and has a fondness for the cold, arrives.