A Battle in the Past to Save the Future! A time portal deposits the Centurions into the wilds of prehistory, where Gorilla Khan and his ape warriors are preparing for their invasion of present day. They'll have to defeat the Conqueror Ape, save the domed city of Atlantis, and destroy the army of psychic dinosaurs before it can be unleashed on their home time! Meanwhile, a modern-day Sally Slick and Mack Silver try desperately to bring their lost companions home before it's too late. In a fight of desperate odds against talking gorillas, psychic dinosaurs, a one-eyed Tyrannosaurus, and a brain in a jar, can our heroes hope to survive and save the world one more time? Find out in this exciting conclusion to the Dinocalypse trilogy!