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.

Shark experts Dr. Riley Elliott and Kori Burkhardt put on a one-of-a-kind shark competition to determine which male Great White Shark is the alpha in a pack of massive adults. In the waters off New Zealand, they compare the sharks speed, hunting ability, and fearlessness to determine who has the swagger to swim away with a female shark.