A model and a private eye help a New York insurance investigator on a deadly case in Acapulco.

A senator is targeted by the Pentangle, a right wing paramilitary group. His pal, a former CIA agent and martial artist, tries to help him. The group kidnaps the agent's sister and tries to hunt him down, "The Most Dangerous Game" style.

On a remote Caribbean island, Army Ranger Joe Armstrong investigates the disappearance of several marines, which leads him to The Lion, a super-criminal who has kidnapped a local scientist and mass-produced an army of mutant Ninja warriors.

The two American Ninjas, Joe Armstrong and Sean Davidson, team up to do battle against a terrorist and his band of Ninjas.