A criminal boss named Osiris runs the entire criminal underworld, dabbling in drug trades to illegal arms. Lately, Osiris has invested in underground fight tournaments and establishes one himself, calling the Lord of the Underground tournament. It is in this tournament, criminals from all over the world, as well as martial artists, athletes, and any willing to participate, are welcomed to challenge themselves in a battle to the death, where the winner faces Osiris for the monetary prize. Who will succeed? Who will be destroyed? Who will be Lord of the Underground?