While Princess Cinder Star of Unicornia and her family are hosting visiting dignitaries from Pegasopolis, it is accidently revealed that one of the pegasi is actually a kelpie! Cinder Star must now protect her new friend, and safely return her to the ocean before she dries up. Cinder Star, Majestic and little Serenity must face the odds and an evil snobby prince in a race against time to save a life of a most unique friend, while learning all they can about her on the way.