In Pixar's Cars, the three-time Piston Cup champion who mentors Lightning McQueen is Doc Hudson.
Doc initially hides his racing history while serving as Radiator Springs's judge and physician. McQueen eventually discovers that Doc was once the Fabulous Hudson Hornet, a celebrated racer whose career ended after a serious crash and a long recovery.
Doc's experience helps him recognize the danger of McQueen's ambition and pride. Their relationship changes from hostility to mentorship as McQueen learns to respect the town and its residents. Paul Newman voices Doc, making the character's measured, older voice part of the film's tribute to classic racing culture.