Doc Hudson is a former race car who serves as Radiator Springs' judge and doctor.
Doc Hudson is a car of few words but many talents. He not only serves as the town judge, he's also Radiator Springs' resident doctor. Doc is respected and admired by the townsfolk for the way he looks out for their health and tends to their aches and pains. No one know too much about Doc before he came to town. He keeps his private life private. But if you've got a bad spark plug or a rattle in your engine, his door is always open.
Doc is portrayed as a grumpy old man who wants to leave his racing career behind, and stay out of the public line. He enjoys peace and quiet, and often isolates himself from the other Radiator Springs residents, instead choosing to stay inside of his clinic and garage.
Doc is based off of the real 1951 Hudson Hornet, which is where his name, number, and paint scheme came from.
During his Piston Cup racing days, Doc was painted in a dark shade of blue, with a chrome bumper and grille. n his doors were the number "51" painted in yellow, as well as the words "Fabulous Hudson Hornet" painted in both white and yellow. He also had the words "Twin-H-Power" on both sides of his hood, and the Piston Cup logo beneath them. Doc also had red racing wheels during his racing career. After arriving in Radiator Springs to set up his own medical clinic, Doc attempted to hide his past by removing most of his decals, leaving only his dark blue coat of paint and his chrome grille, bumper, and lining.
- Doc's racing number, 51, is a reference to the first year of the Hudson Hornet's movement, 1951.