On his first day at a new school, Bastian is chased by a vicious gang called the Nasties. He hides in the school library where he finds a magic book that writes itself according to the imagination of the reader. To escape the Nasties, Bastian wishes himself into Fantasia, the storybook's phantasmic world of incredible creatures. It's here that Bastian feels safe. But when the Nasties take control of the book, his Fantasian friends get stuck on earth, and it's up to Bastian to save them.