An expedition to a remote plateau rumored to be the home of prehistoric beasts. Professor Challenger leads a team of fellow scientists and adventurers deep into the Amazon jungle. The team must battle unforgiving jungle conditions before arriving at the isolated plateau that is their final destination. There they discover a strange group of prehistoric beasts and unexpectedly find themselves in a fight for survival.

Two scientists with a secret time travel project find themselves trapped in the time stream and appearing in notable periods of history.