Dion is a boy of 5 years old, who loves dinosaurs. He occasionally goes to the forest with grandfather to find chestnuts. But in this time he does not only finds chestnuts but also a dinosaur egg and meets a real dinosaur. He calls this one, because he discovered him the Dionsaur.
Together with his sister Iris and his grandfather, they experience exciting adventures. And they come to places where they did not even knew they still existed..........