Alien is very small, but it is his job to shine all the stars and make sure they keep shining, and he has no time for anything else--so when the stars go out one night he is desperate to find the solution, a quest that takes him to Earth.

There is a crisis in the Starlight Kingdom, one of the fantasy worlds: its stars, powered by a special kind of stardust, are fading and may soon go out forever, leaving the Kingdom in darkness--so the Thea sisters and Will Mystery set out for Brightstar Castle to discover what is wrong, but first they must overcome the obstacles and challenges that the fairies are placing in their way.

On a slightly scary camping trip to study stars in the night sky, Owly and Wormy make new friends.