After navigating the extinction perils at the end of the Permian, the third episode in this series finds us in the Mesozoic, just in time for the Age of Dinosaurs, Down Under. Things get off to a shaky start though with the planet left so devastated that the landscape where Sydney now stands was a sandy wasteland. Until recently, nearly everything we've known about the Age of Dinosaurs has come from other continents. But Australia languishes as a Mesozoic backwater no longer. New discoveries are revealing a southern landscape ruled with a reptilian rod: dinosaurs stomped in the west, stampeded in the east and shivered in the south. Some were among the largest dinosaurs to have walked the planet.