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When half-breed Indian Yaqui Joe robs an Arizona bank, he is pursued by dogged lawman Lyedecker. Fleeing to Mexico, Joe is imprisoned by General Verdugo, who is waging a war against the Yaqui Indians. When Lyedecker attempts to intervene, he is thrown into prison as well. Working together, the two escape and take refuge in the hills, where Lyedecker meets beautiful Yaqui freedom fighter Sarita and begins to question his allegiances.
Professor Challenger leads an expedition of scientists and adventurers to a remote plateau deep in the Amazonian jungle to verify his claim that dinosaurs still live there.
At Rio Galdez's remote Brazilian trading post live assorted outcast Americans and Europeans, including Jerry Russell, ex-engineer who became obsessed with the Jivaro headhunters' treasure, quit his job, and took up with the bottle and local girl Maroa. But he still gets letters from his nominal fiancée in California, and unexpectedly the shapely, glamorous Alice Parker arrives, expecting to marry a rich planter. Disillusioned, Alice is almost ready to fall into Rio's arms when news comes that Jerry is missing in Jivaro country.
