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 to prove his claim. 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 humans doing battle in a magnificent landscape. The first film adaptation of Sir Arthur Conan Doyle's classic novel, The Lost World featured pioneering stop-motion special effects.