Lightning McQueen's former-racer mentor in Pixar's Cars is Doc Hudson.
Doc is the town doctor and judge of Radiator Springs, but he is secretly the famous Fabulous Hudson Hornet. In his racing career, he won three Piston Cups before a crash ended his competitive future and left him disillusioned with the racing world.
Lightning initially treats Doc with little respect, but the older car eventually teaches him about racing technique, humility, and the value of community. Doc's history gives Lightning a possible view of his own future: success can be meaningful, but identity cannot rest only on trophies.
Paul Newman voices Doc Hudson in Cars. The character is inspired by the real Hudson Hornet, a car associated with early stock-car racing success, but Doc himself is fictional.