The son and heir to Los Angeles' largest newspaper fortune, Britt Reid (Seth Rogen) is a rich, spoiled playboy who has been happy to maintain a direction-less existence. When his father James Reid (Tom Wilkinson) mysteriously dies, Britt meets an impressive and useful company employee, Kato (Jay Chou). They soon realize that they have the resources to do something major with their lives and finally step out of James Reid's shadow. Kato creates the ultimate weapon, The Black Beauty, an indestructible car with every weapon and gadget imaginable. In order to be heroes, Britt decides that they will have to pose as villains. With the help of Britt's secretary, Lenore Case (Cameron Diaz), they learn that the biggest criminal in the city is named Benjamin Chudnofsky (Christoph Waltz). He has united every gang in the city under his power, and he quickly sees that the Green Hornet is a direct threat to the successful criminal underworld he controls.