Big D is a character in Mater Private Eye.
Mater Private Eye
Big D car-napped (Kidnapped)Mia, and is trying to use her as another one of his workers who make counterfeit tires. When Mater sets off to the docks, he tried to sneak in by wearing boxes over himself. Big D's pitties see him, and a crane takes off Mater's disguise. Big D then threatens to throw Mater into the ocean. However, Lightning McQueen and a squad of police cars arrest him, and free Mia and Tia, which spoils his plan.