Immanuel Velikovsky proposed in his 1950's book "Worlds in Collision" that many myths and traditions of ancient peoples and cultures are based on actual events: worldwide global catastrophes of a celestial origin, which had a profound effect on the lives, beliefs and writings of early mankind. This is a documentary about Immanuel Velikovsky's discoveries by Henry Zemel. First telecast on February 22, 1972 by the Canadian Broadcasting Corporation.