In Australia, scientists have made an astonishing discovery: there's not just one population of great whites, there's two. And one appears deadlier than the other. Experts pit the shark tribes against one another to discover what's really going on.

Snoop Dogg breaks down the craziest encounters, marvels at the wild and unpredictable reactions, and meets with experts trying to unlock the secrets behind why great white sharks are taking up residence along America's shores.