In Pixar’s Cars, Doc Hudson serves as Radiator Springs’ judge.
Doc is introduced as the town’s respected physician and judge, but his past is far more significant than Lightning McQueen first realizes. He was once a celebrated race car known as the Fabulous Hudson Hornet, a three-time Piston Cup champion whose career ended after a serious crash and an unsympathetic return to racing.
Doc initially resents Lightning’s celebrity-driven attitude and tries to keep him away from racing. Their relationship changes as Lightning learns about Doc’s history and Doc recognizes that the young racer may have the discipline to succeed.
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. This question concerns Doc’s role in the fictional town, not the real automobile model that inspired his design.