Keiko, the world’s most famous orca, was the star attraction at an amusement park in Mexico City and an icon for an entire generation. For years, he lived in a human-designed world. Hollywood thrust him onto the global stage as the star of Free Willy, sparking a worldwide animal rights movement. What began as a dream shared by millions of children to see him return to the ocean transformed into one of the most ambitious and controversial animal reintroduction experiments in history.