Description
Professor Challenger (Claude Rains), a celebrated biologist and anthropologist, reports to the London Zoological Society that he has discovered living specimens of supposedly extinct animals, including dinosaurs, on an expedition to the Amazon Basin and up a barely known plateau.
Much to Challenger's dismay, he has attracted a few very unscientific people to join him on his second journey to the Amazon. This expedition group includes big game hunter Lord John Roxton (Michael Rennie), newsman Ed Malone (David Hedison) whose publisher advances $100,000 to pay for the expedition. The publisher's adventurous daughter, Jennifer (Jill St. John) and son David join the group at the head of the Amazon. Also, in the group is a Zoological Society bigwig (Richard Haydn), helicopter pilot Gomez (Fernando Lamas) and sidekick Jose Costa (Jay Novello).
During the first night on the plateau, a dinosaur wrecks the helicopter. As the expedition proceeds, Malone chases a primitive jungle girl (Vitina Marcus) through cobwebs to a giant spider. Roxton argues with the others, and jealousies over Jennifer leads to a fistfight between Malone and Roxton. They discover a diary of a previous explorer, Burton, who was lost on the plateau. Roxton is mentioned several times in the diary. Roxton reveals that he had visited the plateau years before, and claims the plateau holds a bounty of diamonds.
At one point, Malone and Jennifer are separated from the others and have a near death encounter with two battling dinosaurs. Cannibals kidnap the members of the party, but before they can become dinner the jungle girl leads them to a passage that leads down off the plateau. Along the way, they encounter Burton, now living as a blind hermit. They encounter more obstacles — pursuit by cannibals, spider plants, the "graveyard of the damned", and a dinosaur in a lava pit guarding the diamonds. During a volcanic eruption, they escape from the plateau carrying the egg of a Tyrannosaurus rex. The egg hatches when it is dropped by accident, and Professor Challenger decides to take the infant dinosaur back to London with them.
