This was the first screen adaptation of the Sir Arthur Conan Doyle story of prehistoric creatures still alive on a remote Amazon plateau. An expedition lead by Professor Challenger and consisting of a newspaper reporter, a big-game hunter and his servant as well as the daughter of the plateau's discoverer, who is still stranded in this uncharted land. After a long journey, the group finds the prehistoric land and encounters all kinds of remarkable plants, dinosaurs and ape-like men. After exploring this amazing world, the explorers return home to their native London with proof of their discoveries, a brontosaurus, which escapes captivity and runs rampant through the streets.