The Mafia learns that a new civic center will be built, and they buy all of the land for the site of the building—all except for one place: a karate school owned by Pop Byrd (Scatman Crothers). They arrange to have Pinky (Malik Carter) come by to force Pop to sell his land, but he is killed by them. It's up to the karate school's students to get the hero, Black Belt Jones (Jim Kelly), for help. Sydney (Gloria Hendry), the daughter of the late Pop Byrd, won't sell the building. Because both of them are martial arts experts, they join forces to "clobber the mob".