In Pixar's Cars, Doc Hudson is the legendary racer known as the Fabulous Hudson Hornet.
Doc initially appears to be the respected medical doctor of Radiator Springs, but the film reveals that he once had a celebrated racing career. He won three Piston Cups before a crash ended his competitive career and left him bitter about the racing world.
The character is based on the real Hudson Hornet, a car manufactured by the Hudson Motor Car Company. The real model became famous in stock-car racing during the early 1950s, especially through drivers such as Herb Thomas, who won NASCAR championships in Hudson Hornets.
Doc's past explains why he recognizes McQueen's talent but resists helping him. The story also makes him a bridge between real American racing history and the fictional Piston Cup competition.