The most vicious and insane populations of bull sharks from Australia and America faceoff in a no-holds-barred showdown beneath the water. Bull Shark-attack survivor Paul de Gelder contends that his Aussie sharks are the toughest, while American shark biologist Dr. Craig O'Connell attempts to find the meanest sharks Florida has to offer to take the crown. 

Off Mozambique's coast, sharks swarm a hidden peak, hunting Giant Trevally in a once-a-year feeding frenzy. But when 5,000 Trevally fight back, the hunters become the hunted in one of the ocean's wildest showdowns.