El joven periodista Edward Malone ha de cubrir una conferencia sobre dinosaurios impartida por el paleontólogo Summerlee. También participa el profesor Challenger, un investigador que presenta restos de un dinosaurio alado y propone que se organice una expedición al refugio amazónico de los últimos animales prehistóricos.

In the 1930s a trio of unlikely adventurers set off to find a heretofore uncharted land. It has existed in stories and myths for centuries and is believed to be somewhere around the North Pole. Hounded by an overambitious agent of the USSR, the explorers end up finding much more than they ever expected.

Host Richard Crenna reviews various theories on the existence of a site for the legendary Atlantis described by Plato and envisioned by mystic Edgar Cayce.