Together with their parents, Prince William and Catherine, Prince George, Princess Charlotte and Prince Louis embark on a fantasy journey to the magical, beautiful world of Startiny in William's magic helicopter, Helios! The children, alongside their companions, must do battle with an Evil Queen and rescue not only the Virgin Mary, but also the angel of the Christmas tree and Santa's reindeer before Christmas Day arrives. Otherwise, they will not get back in time to receive their Christmas presents.