In Pixar's Cars 2, which international racing series is central to the film's plot?

In Pixar's Cars 2, the World Grand Prix is the international racing series at the center of the plot.

The competition is organized by Sir Miles Axlerod to promote Allinol, an alternative fuel. Lightning McQueen enters the event and competes in races held in locations including Tokyo, Porto Corso, and London.

Mater becomes involved in an espionage story after being mistaken for an American secret agent. The racing storyline and the spy plot eventually connect when the villains target the World Grand Prix and manipulate the Allinol controversy.

The World Grand Prix should not be confused with the Piston Cup. The Piston Cup is the domestic stock-car championship featured in the first Cars film, while the World Grand Prix is an international event created specifically for Cars 2.