Ten-year-old Ray Grey lives in the magical kingdom of Celestia, high in the sky! Ray is a trainee Cloud Weatherling and one day her magic will help to control and look after all the weather on Earth. That is, if Ray can learn how to use her magic properly! One day - on the night of the Solunar Eclipse, Ray's life changes forever when she is transformed from plain old Ray into Rainbow, with awesome rainbow powers at her fingertips! With the help of her best friends (and exploding cloud cat, Nim), now all Ray has to do is master her magic and save the world from the ultimate storm.