The Lost Worlds of Planet Earth Ortelius hypothesized the idea that land masses may have been connected in the past, Alfred Wegener who hypothesized the idea of a super-continent Pangaea and continental drift despite the prevailing idea of flooded land-bridges at the time, and Bruce C. Heezen and Marie Tharp who discovered the Mid-Atlantic Ridge that supported the theory of plate tectonics. Tyson describes how the landmasses of the earth lay atop the mantle, which moves due to the motion and heat of the earth's outer and inner core. Tyson moves on to explain the asteroid impact that initiated the Cretaceous–Paleogene extinction event, leaving small mammals
The Legend That Was Earth flee, and their Hyadean allies suffer a massive defeat when a Hyadean mission is bombed. Finally, it appears the organization is done for entirely when a formation of giant airships appears. The ships are believed to be both Hyadean and capable of mass destruction. However, the ships belong to a friendly third party of a different alien civilization, the Querl; these aliens have come to help Terrans. CounterAction gets the news that the Hyadean government has just crumpled from popular indigenous support for Earth, and the war is over. New governments form and a stronger, benevolent union between Earth and