U.S. soldier Frank Dux has come to Hong Kong to be accepted into the Kumite, a highly secret and extremely violent martial arts competition. While trying to gain access into the underground world of clandestine fighters, he also has to avoid military officers who consider him to be AWOL. After enduring a difficult training and beginning a romance with journalist Janice Kent, Frank is given the opportunity to fight. But can he survive?

Wicked ninja drug lords do their darnedest to prevent a scientist from making public his newly developed cure for heroin addiction.

Roger Kimsky runs a huge arms-dealing organisation, the Black Ninja Empire - a ruthless band trying to gain control of the free world. Whatever the reason, whoever he has to kill, Kimsky will do it to achieve his ambition. A policewoman, Jane, undercover as a boutique sales girl, manages to capture the affections of Mark, a significant figure in the Black Ninja Empire. Risking her life she must get closer to the Empire's headquarters. Detectives Alex and Jerry Brown want justice. The two together determine to put away their deadliest opponent, Mark. In order to prevent firther investigation, Mark orders the deaths of Alex's wife and son. The two bloody deaths drive Alex into an uncontrollable rage of revenge, a rage which could put Janes life into further jeopardy.

An evil corporation it out to harvest organs from live people and smuggle them into the country. It is up to our hero to find out who is behind this illegal operation and put an end to the group once and for all.