Orcas and other toothed whales are attacking Great Whites in record numbers, marking the latest chapter in a 60-million-year battle between Sharks and Whales. This rivalry began with The Leviathan, a prehistoric whale that once went tooth to tooth with the greatest predator to ever swim the oceans... The Meg. Now, Dr. Tristan Guttridge, Dr. Sona Kim, and Kina Scollay recreate these epic battles and study orca tactics to discover the ultimate predator.

A wave of savage assaults against the sea lion population off California's coast has sparked fears of a monstrous predator dubbed "Mako-Zilla." Recent discoveries, including a 600-pound mauled sea lion with massive gashes, hint that a 16-foot-long predator could be responsible. A team of shark experts, including bite specialist Jeff Harris and Dr. Craig O'Connell, embark on a mission to unveil the identity of the colossal predator haunting the coast.

Returning to the site of his own 2009 shark attack for the first time, Paul de Gelder joins Madison Stewart to investigate a recent Great White Shark attack that occurred near Sydney Harbor, Australia - the first fatal incident in the region in almost 60 years. The dramatic encounter, which was captured on camera, was the sixth attack to occur in as many weeks. Within this aquatic arena, Great Whites contend with Bull Sharks, Tiger Sharks, and even humans in a colossal battle for supremacy. The unfolding saga raises the compelling question of who will emerge victorious in this intense struggle for dominance.