The evil criminal leader Kendrick has kidnapped an elderly biochemist who holds the secret to creating a biological superweapon. The only person who can possibly stop Kendrick and his gang is L. A. cop Sam Kettle and martial arts master Jun Kim (uncle of a little girl also kidnapped by Kendrick). Together, they go to war against an army of ninjas to rescue the hostages and bring their kidnappers to justice.

Tony, the new kid at school, befriends gang leader Young, whose top rival is Chan. When Young defeats Chan in battle, two mysterious men offer Tony and Young jobs at a security agency, with one of their new clients being among the city's most notorious drug dealers.

Martial artists in America battle over the possession of three ancient Chinese statues.

Jake Carver needs to retrieve a microfilm containing information which would cause a Wall Street panic and an economic crisis for Western governments. Also seeking the microfilm is the villainous Adam who plans to sell the microfilm to the highest bidder. Fist fights, explosions, and car chases ensue.