Many of us have experienced the excitement and awe of watching 8,000-pound orcas, or “killer whales,” soar out of the water and fly through the air at sea parks, as if in perfect harmony with their trainers. Yet, in our contemporary lore this mighty black-and-white mammal is like a two-faced Janus—beloved as a majestic, friendly giant yet infamous for its capacity to kill viciously. Blackfish unravels the complexities of this dichotomy, employing the story of notorious performing whale Tilikum, who—unlike any orca in the wild—has taken the lives of several people while in captivity. So what exactly went wrong?