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Lord Miles, who has developed new energy, holds the World Cup Grand Prix, attracting many skilled racers. However, the reigning champion of the Piston Cup, Lightning McQueen (voiced by Huang Lei), is notably absent. It turns out that he has just returned to Radiator Springs to enjoy a happy vacation with his good friends, Mater (voiced by Fan Wei), and his girlfriend Sally. Due to the provocation of the Italian Formula One racer Francesco Bernoulli, and also out of jealousy, McQueen eventually agrees to participate in the World Cup, taking Mater and other friends along to travel around the world. On the day before the Japanese race, Mater accidentally meets British spies Mike and Holly (voiced by Yao Chen), who are investigating the new activities of a criminal gang. Mater is mistakenly identified by Holly as an American contact agent, and thus gets entangled in trouble. On the following day during the race, McQueen competes fiercely with Bernoulli, while simultaneously, several racers experience unexpected engine failures. Mater also witnesses a confrontation between Mike and the mysterious organization. As a result of these series of incidents, the friendship between McQueen and Mater is shaken, and the mastermind behind all these events gradually reveals their true identity...