In Pixar's Cars, the racing legend who mentors McQueen is Doc Hudson.
Doc is introduced as Radiator Springs' judge and physician, but McQueen gradually learns that he was once the famous Fabulous Hudson Hornet. Doc won three Piston Cups before a serious crash ended his racing career and left him bitter about the sport's treatment of older racers.
His relationship with McQueen changes when the younger car begins to respect the town and its history. Doc eventually becomes McQueen's crew chief and helps him prepare for the race, turning a reluctant local authority into an important mentor.
Doc Hudson is voiced by Paul Newman, whose own public image as a race-car driver and racing enthusiast gave the character an especially apt performer. The character is inspired by the real Hudson Hornet, a celebrated American car associated with stock-car racing in the early 1950s.