When the movie “Free Willy” is released, word gets out that the star, a killer whale named Keiko, is sick and living in a tiny pool at a Mexican amusement park. An environmentalist sets out to give the fans what they want: their favorite celebrity orca back in the sea.   Our newest podcast, “The Preventionist” is out now. Search for it wherever you get your podcasts.To get full access to this and other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify, subscribe at nytimes.com/podcasts.To find out about new shows from Serial Productions, and get a look behind the scenes, sign up for our newsletter at nytimes.com/serialnewsletter.Have a story pitch, a tip, or feedback on our shows? Email us at serialshows@nytimes.com