In Pixar’s Cars, Doc Hudson is revealed to have been a three-time Piston Cup champion. Before becoming Radiator Springs’ judge and doctor, he was a celebrated race car known as the Hudson Hornet.
Doc’s racing career ended after a serious crash caused him to miss the 1951 season. Although he recovered, the racing world treated him as old news and replaced him with younger competitors. His bitter experience explains why he initially refuses to coach Lightning McQueen.
The character is based partly on the real Hudson Hornet, a car that achieved major success in early stock-car racing. The fictional Doc combines that automotive history with the voice and personality of Paul Newman, who was both an actor and an accomplished racing enthusiast.
Doc eventually recognizes that Lightning can learn from his mistakes. His return to the racing team as a crew chief allows the film to connect his forgotten past with a more generous role in the present.