Principal Skinner opens a CTU — Counter Truancy Unit — at Springfield Elementary School, with Lisa heading up the operation. Homer is sent to dispose of a container of yogurt so far past its freshness date that it could be toxic. The reeking yogurt falls into the hands of ne’er-do-wells Dolph, Jimbo, and Kearney. With the help of Jack Bauer and Chloe O'Brian, Bart and Lisa race against the clock to stop the bullies from releasing the ultimate stink bomb at the school’s bake sale.