Loosely based on the life of real-life swimming sensation Annette Kellerman, Million Dollar Mermaid stars Esther Williams as a young woman who overcomes a genetic disorder in her leg through swimming and eventually becomes one of the greatest swimmers in the world. An opportunistic showman recognizes her skill and arranges for her to perform an unthinkable feat with his trained kangaroo. The swimmer and manager have a tempestuous relationship both in and out of the water, until she is forced to face her true feelings. Busby Berkeley puts his skills with the masses to use underwater, hiring over one hundred swimmers to bring new life to “Let Me Call You Sweetheart.”