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.