In Pixar's Cars, the retired racer who lives in Radiator Springs is Doc Hudson. He serves as the town's judge and physician while hiding his earlier career from Lightning McQueen.
Doc was once a famous Piston Cup racer known as the Hudson Hornet. His career ended after a crash left him unable to compete, and the racing world quickly moved on. His history explains both his knowledge of racing and his initial resentment toward McQueen's arrogance.
Doc is voiced by Paul Newman, whose performance was the character's final voice role in a feature film. The character's design is based on the real Hudson Hornet, a car associated with stock-car racing success in the early 1950s. Doc's past becomes a warning about the cost of allowing fame to replace relationships.