Scott James, a veteran martial arts expert, is recruited as the protector of the wealthy and beautiful Justine after she becomes the target of a ninja clan. When Scott finds out that his ruthless arch-nemesis, McCarn , is involved with the stealthy and dangerous criminals, he is eager to settle old scores. Soon Scott is facing off against McCarn and the entire ninja horde in an effort to take them all down.

A Vietnam veteran, Charles Rane, returns home after years in a POW camp and is treated as a hero. When thugs invade his home to steal the silver coins he received for his service, they mangle his hand and leave him and his family for dead. Rane survives and becomes obsessed with getting revenge. Aided by his loyal friend Johnny Vohden, Rane, now wielding a hook for a hand, sets out on his mission of vengeance.