Serena spends her day hunting and playing in the cool waters of the Pacific Ocean. All that ends when she is separated from her nursery by a violent storm. Joining a migration group Serena hopes to soon return to her home waters. However, a dangerous encounter with fishing nets called Tanglers send Serena and her three friends swimming desperately out to sea. With no adults to help them, the four young dolphins set out on a great journey to understand...