In pursuit of Doc Terror, Ace and Jake manage to force the criminal genius to crash land in the vast African jungle. There, Terror and Hacker stumble across an underground remnant of prehistoric earth, and he sets out to create an army of dinosaur cyborgs. However, Jake and Ace find the cave and attempt to prevent the villain from destroying the present with the past! But first they must contend with the lizard-like race who inhabit this inner world, and who have fallen under Terror's control...