After the movie “Free Willy” became a hit, word got out that the star of the film, a killer whale named Keiko, was sick and living in a tiny pool at a Mexican amusement park. Fans were outraged and pleaded for his release. “The Good Whale” tells the story of the wildly ambitious science experiment to return Keiko to the ocean — while the world watched. An epic tale that starts in Mexico and ends in Norway, the six-episode series follows Keiko as he’s transported from country to country, each time landing in the hands of well-intentioned people who believe they know what’s best for him – people who still disagree, decades later, about whether they did the right thing.

Sign up for our newsletter to see photos and videos of Keiko, and get a behind the scenes look at the making of The Good Whale. Sign up at nytimes.com/serialnewsletter

Subscribers to the New York Times can listen to all episodes of The Good Whale early, and access the full archive of other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify. Subscribe at nytimes.com/podcasts

Have a story pitch, a tip, or feedback on The Good Whale or other shows from Serial Productions? Email us at serialshows@nytimes.com