In Pixar's Cars, the retired race car who serves as Radiator Springs' doctor is Doc Hudson.
Doc is a 1951 Hudson Hornet and one of the town's most respected residents. He initially appears stern and uninterested in McQueen's racing ambitions, especially after McQueen causes damage and disruption in Radiator Springs.
The film later reveals that Doc was once a celebrated racer. He won three Piston Cups before a serious crash ended his career, and he disliked how the racing world quickly replaced him with younger drivers. His experience helps explain his guarded attitude toward McQueen.
Doc's character was voiced by Paul Newman, whose performance was one of the film's major attractions. The character also reflects the real racing reputation of the Hudson Hornet, which was successful in early NASCAR competition.