Star race car Lightning McQueen and his pal Mater head overseas to compete in the World Grand Prix race, an international event showcasing a new alternative fuel called Allinol. But when Mater gets caught up in an intriguing adventure of his own, he becomes embroiled in an international espionage mission that risks both his and Lightning's lives. As they navigate the treacherous world of high-stakes racing and high-tech spy gadgets, Mater finds himself torn between loyalty to his best friend and allegiance to a mysterious cause.