When Bart brings his dog into school for show and tell during one of Super Intendant Chalmers inspections, it suddenly disappears into the ventilation ducts. Skinner panics and sends Willie up after Santa's Little Helper, but as soon as Chalmers is about to leave, the gym is almost destroyed and Chalmers is raging. That is until the dog falls on him, and he shows a loving side. Which only lasts a few seconds because a greasy Scotsman lands on him afterwards, and Skinner gets fired. After a while he misses his job so much, and enrolls himself into the army. However Bart feels guilty about what he's done and forms an alliance with Skinner as they plan to get rid of new principal Ned Flanders, with Skinner back in charge. Once they've done this though, they go back to being enemies.