Doc Hudson is the veteran racer who once drove as number 51 in Pixar’s Cars 3.
Doc is introduced in Cars as the quiet judge and local doctor of Radiator Springs. He was once the Fabulous Hudson Hornet, a celebrated racer who won three Piston Cups and raced with the number 51 before an injury ended his career.
Cars 3 revisits Doc’s racing history through McQueen’s memories and training. His experience becomes an important model for McQueen as he faces faster, technologically advanced competitors. The film shows how Doc’s past continues to influence McQueen’s choices even after Doc’s death.
Smokey, Louise Nash, and River Scott are also connected to the older generation of racers in Cars 3, but they are separate characters. Doc Hudson’s distinctive racing number is 51, matching the real-world Hudson Hornet associated with NASCAR history.