He meets the adventurer John Roxton in a museum and goes on with him to attend a seminar where professor Challenger claims to have discovered living Dinosaurs in Brazil. Everyone claims the professor is mad, but he hires Roxton and Malone to conduct an expedition to bring back evidence, but both of them fall in love with the same girl, Paula. The crew climbs up on a plateau in Brazil and discovers an aggressive Brontosaurus. There are also other dangers; evil monkeys, Allosaurus, an active volcano. The crew manages to escape, capture a living Brontosaurus and bring it to London. But there the beast escapes.