When they reach the plateau they find Maple White was right, there is a lost world of dinosaurs and giant apes. Naturally there are plenty of dangers for our humans to survive including a giant apeman and a volcanic eruption. Plus a bit of a love triangle with Paula, Ed Malone (Lloyd Hughes) and Sir John Roxton (Lewis Stone) - probably better places for that kind of thing to be honest when there are Allosauruses feasting on Pteranodons in the background. An entertaining film with good stop-motion special effects, especially for the day.
On a historical note, this was the very first film to be shown on an airliner during a flight (Imperial Airways).
