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Duncan, also known by his nickname Furious D, is a racehorse.

Duncan initially was an attraction at the State Fair, where he was forced to dive off a high diving board into a small pool of water. This show was then shut down by Chief Wiggum as it was animal cruelty. After the owner ran away, Chief Wiggum was going to send Duncan to become dog food, but Bart wanted to adopt him instead, which the rest of the family agreed to, despite knowing it would cost them a lot of money to feed him. They then took Duncan home, strapping him to the roof of the car.

Homer decided that Duncan would have to earn his keep and first tries him out at football, which Duncan proved to be good at. Homer then found out that horses weren't allowed to take part in the NFL. Bart then realized that Duncan was fast so they decided to try him out as a race horse instead. Duncan's first race had him finish last after he was too scared and intimidated to start. But Bart managed to talk him round to running...