Three Heroes and the Navel of the World

In the realm of fairy tales, we are familiar with the tales of Once Upon a Time, but what lies even before? The Three Heroes are on the verge of unraveling this enigma, despite never posing the question themselves. Extraordinary events unfold, leaving even the ingenious Horse Julius at a loss, as Dragon Fireworm unexpectedly stumbles upon a tiny dinosaur. Meanwhile, Alex, the Prince, and their faithful Horse Julius plummet into the depths of the past of the Earth. Now, they must urgently devise a plan to journey back to the present. Above all, they yearn to uncover the identity of the enigmatic Navel of the World.