Doc Hudson’s background in Pixar’s Cars is inspired by NASCAR.
Doc is a 1951 Hudson Hornet who once raced as the Fabulous Hudson Hornet. The character’s history reflects the real Hudson Hornet’s importance in early stock-car racing, especially its success in NASCAR during the early 1950s.
In the film, Doc won three Piston Cups before a crash ended his racing career. He later becomes Radiator Springs’ doctor and initially hides his former identity from Lightning McQueen. His story parallels the career arc of a celebrated racer who is forgotten when newer competitors arrive.
The Piston Cup is fictional, so it is not the same championship as NASCAR’s real premier series. The filmmakers used real automotive history as inspiration while creating a world populated by anthropomorphic vehicles. Paul Newman provided Doc’s voice, making the character especially memorable in the first Cars film.