In Pixar's Cars, the veteran racer formerly known as the Fabulous Hudson Hornet is Doc Hudson.
Doc is a 1951 Hudson Hornet who lives in Radiator Springs and works as the town's doctor. His hidden racing past explains his impatience with McQueen's arrogance and his reluctance to discuss his own career. Doc eventually becomes McQueen's mentor and teaches him that racing skill involves more than speed.
The character is based on the real Hudson Hornet, a car famous for its success in early stock-car racing. The film's fictional Hudson won three Piston Cups and wore the number 51, echoing the historic Hornet's racing identity.
Doc Hudson was voiced by Paul Newman in Cars. Newman was a celebrated actor and a real racing enthusiast who competed professionally. Because Doc is both a medical doctor and a former champion, the title “Doc” describes his role in Radiator Springs while also concealing his sporting history.