Luna Grace and her family arrive on Earth at midnight. Luna is from Starbright, a colourful planet in another galaxy, and they have come to Earth to study its wonderful wildlife. The mission is simple - Luna and her family need to fit in with their new neighbours down on Earth. But fitting in is hard to do when your hair changes colour depending how you feel, you can move things with your mind and you have a mischievous moon cat called Twizzle!

Luna is determined to try her best, but as she embarks on her first day at school, things get cosmically out of control! What can Luna do to make herself like her new classmates? Or will she find the courage to be different?