There's a race to get to the Rio Reverso -- a SGW that turns an object back into original form -- a tree to an acorn; a bird to an egg; a butterfly to a moth. Master Fung warns that this SGW is most dangerous because it is so unpredictable. It doesn't always act in expected ways. Jack lays claim to the SGW and accidentally turns an oil slick into a small dinosaur. He figures that he can create an army of dinosaurs but winds up getting more than he bargained for.
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