Pearl is an ordinary girl — but she has a very extraordinary secret. She is a real sea princess! Pearl is enjoying a quiet sleep in the summer sun when she suddenly wakes up in the Underwater Kingdom and is transformed into a sea princess. The Prima Ballerinas are staying and are holding auditions for the chorus. All the princesses practise hard, expect for Princess Anastasia who already thinks she is the best. Will Pearl ever fulfill her dream of becoming a ballet star?