Which character is Lightning McQueen's mentor in Pixar's Cars?

Doc Hudson is Lightning McQueen's mentor in Pixar's Cars.

Doc initially appears to be the Hudson Hornet who serves as Radiator Springs' doctor and judge. Lightning later learns that Doc was once the famous Fabulous Hudson Hornet, a three-time Piston Cup champion whose racing career ended after a serious crash and an era of neglect from the racing world.

Doc recognizes Lightning's talent but distrusts his arrogance. After Lightning damages Radiator Springs' road, Doc oversees his punishment and gradually becomes involved in his rehabilitation. Their relationship changes from hostility to mentorship as Doc teaches Lightning that racing is not only about speed and trophies.

Doc is voiced by Paul Newman, whose own public image as a racing enthusiast adds resonance to the role. Newman competed in motorsports and co-founded the racing team Newman/Haas Racing. The character's history also explains why Doc understands Lightning's career pressures better than most residents of Radiator Springs.