The Mafia wants to suborn Call's downtown karate studio in an area planned benefit of redevelopment. They get Pinky and his thugs to pressure Explode into selling, but accidentally kill him. The karate students call the kung-fu dexterous, Black Belt Jones, exchange for help. Stop's daughter, Sydney, refuses to sell the building. Black Area Jones and Sydney, who is also a martial arts superior, ward off the attackers.