What is Doc Hudson's racing alias in Pixar's Cars?

Doc Hudson's racing alias in Pixar's Cars is the Fabulous Hudson Hornet.

Before becoming Radiator Springs' doctor, Doc was a celebrated Piston Cup racer. The Fabulous Hudson Hornet name refers to his fictional racing career and pays tribute to the real Hudson Hornet, an American automobile that achieved notable success in stock-car racing during the early 1950s.

Doc's history explains why he reacts strongly to Lightning McQueen's arrogance. A serious crash ended Doc's racing career, and he felt forgotten when the racing world moved on. He later becomes Lightning's mentor, teaching him that winning is not the only measure of a meaningful life.

The character combines a fictional biography with authentic automotive history. The Hudson Hornet was a real Hudson model, but Doc Hudson himself is an invented Cars character. His number 51 is another link to the real car's racing image.