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It's a big day at Springfield Elementary; Superintendent Chalmers and Principal Skinner will select who gets the school's vending machine contract. While a gumbo machine sounds interesting, the winner is Scammer & Z-Dog, complete with hip-sounding vending machines. Lisa discovers that the snacks are loaded with everything from hydrogenated petroleum oil to partially-deweaponized plutonium, but her protests are no match for the machine's slogans. Bart goes overboard with the snacks; three weeks later, either Uter's hair has turned yellow and spiky, or Bart is incredibly fat. After a heart attack and a failed attempt at diet and exercise, Bart is sent to an expensive fat camp, and Homer and Marge have to open the house to German students in order to pay for it.