Geronimo Stilton's ancient ancestor is back in another prehistoric adventure!

When Geronimo Stiltonoot and his family save a young dinosaur from the river, they have no idea what they’re in for. The dino and Benjamin quickly become the best of friends… but this little creature has a tremendous talent for mischief!

Can Geronimo return the playful dinosaur to his herd before he causes a megalithic disaster in Old Mouse City?