Sinopsis English
Britt Reid (Seth Rogen) is the 28-year-old slacker son of widower James Reid (Tom Wilkinson), publisher of the Los Angeles newspaper The Daily Sentinel. Britt is an irresponsible playboy, but his attitude changes when James is found dead from an allergic reaction to a bee sting. After the funeral, Britt fires the staff aside from his maid and Kato (Jay Chou), James' mechanic and a skilled martial artist.

Britt and Kato get drunk together and, upon agreeing that they both hated James, visit the graveyard to cut the head off James' memorial statue as payback. After they succeed, they see a couple being mugged, and rescue them. Britt and Kato are themselves mistaken by police for criminals and chased through the streets, but Kato evades them and he and Britt return to the mansion.

Britt convinces Kato they should become crime-fighters who pose as criminals in order to infiltrate real criminals, and also to prevent enemies from using innocents against them. Kato agrees, and develops a car outfitted with several gadgets and weapons, which they call the Black Beauty. Britt plans to capture Benjamin Chudnofsky (Christoph Waltz), a Russian mobster who is uniting the criminal families of Los Angeles under his command, and whom his father was trying to expose. To get Chudnofsky's attention, Britt uses the Daily Sentinel as a vehicle to publish articles about the "high-profile criminal" the Green Hornet.

berkisah tentang seorang anak miliyuner di Los Angeles bernama Britt Reid (Seth Rogen) yang mewarisi kekayaan ayahnya setelah mendapati ayahnya meninggal secara misterius. Bersama dengan karyawan kepercayaan di perusahaan sang ayah, Kato (Jay Chou), Britt bermaksud untuk melakukan sesuatu yang berharga dalam hidupnya – memberantas kejahatan.

Dibantu oleh Kato sebagai pendampingnya, Britt berubah menjadi The Green Hornet dan membasmi semua criminal yang berkeliaran di jalan, hingga akhirnya mereka berdua dihadapkan dengan bos mafia paling kejam di LA, bernama Benjamin Chudnofsky (Christoph Waltz).

The Green Hornet dilengkapi dengan berbagai senjata api yang lumayan keren buatan Kato, dan juga sebuahmobil superhero yang diberi nama The Black Beauty sebagai tumpangannya yang keren untuk berpatroli di kota LA.