Master martial artist Masahiro Kai is a shadow of the champion fighter and trainer he once was. After his protégé was slain in a no-holds-barred, underground fight by the incomparable Chang Lee, Kai slips into a numbing alcohol-induced stupor to try to forget the past.

If your enemy refuses to be humbled... Destroy him. Accompanied by his brother Kurt, American kickboxing champion Eric Sloane, arrives in Thailand to defeat the Eastern warriors at their own sport. His opponent: ruthless fighter and Thai champion, Tong Po. Tong not only defeats Eric, he paralyzes him for life. Crazed with anger, Kurt vows revenge.

The film begins following the British victory of the first Opium War and the seizure of Hong Kong. Although the island is largely uninhabited and the terrain unfriendly, it has a large port that both the British government and various trading companies believe will be useful for the import of merchandise to be traded on mainland China, a highly lucrative market.