In Middle Cretaceous Argentina, Marven searches for the largest dinosaurs of all time. He encounters a herd of Argentinosaurus, one of the largest sauropod dinosaurs, and observes the long and drawn-out hunt of the sauropods by one of the largest predatory dinosaurs, Giganotosaurus. During his journey, Marven also uses a small plane to fly with pterosaurs such as Pteranodon and Ornithocheirus, and he also encounters the massive crocodyliform Sarcosuchus.