Pilot Frank Scott takes his sons, half-brothers raised by different mothers, along on an island hopping holiday, but just after spotting an unchartered yet inhabited large isle, the plane crashes at sea and unconscious Frank presumably drowns. Dardevil Karl and cautious, studious David swim ashore and are astonished to be find a society where people cohabit happily with tame, even speaking dinosaurs. Told there is no way off the island, they must set out on a perilous 'diono-bus' journey, beleaguered by wild pterodactyls and relieved by Oonu's squadron of tame 'skybax' aerial Dino's, to the splendorous capital Waterfall City, where the ruling mayor sends them to mixed school where Marion, whom they befriended o the way, teaches with her saurian life partner, erudite Zippo. David takes to it and saurians, Karl rebels revolted, yet wins a graduation commendation by cheating. Written by
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[Karl has just rescued Zippo from being dragged under and eaten by a Mosasaur guarding the entrance to the World Beneath. Zippo runs away from the shore, screaming in fright
[inspecting his gnawed tail
He was EATING me!
[shakes his fist at the Mosasaur; passionately
I hope you choke on it!