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In London, professor Challenger (Wallace Beery) announces that prehistoric creatures are alive and flourishing in the Amazon jungle and declares his intention to mount an expedition proving his point. Journalist Edward Malone (Lloyd Hughes) volunteers to go and convinces his newspaper to fund the journey. Paula White (Bessie Love) hopes to find her father, a missing explorer. They and others undertake the voyage and witness dinosaurs and humanoids doing battle in a magnificent landscape. Wikipedia