Lumina is a mermaid princess but she doesn't know it! When her Aunt Scylla is called away to the royal palace, Lumina secretly follows after her. Along the way she uses her magical pearl powers to help other sea creatures and make new friends. After a grand entrance at the Royal Ball, Lumina saves the king from being poisoned and is discovered to be the long-lost princess. Lumina discovers that a true princess makes the world a brighter place! Barbie movie titles create a magical world in which girls can immerse themselves. Pearl Princess touches on two favourite themes with girls: Princesses and Mermaids.