Introduced by Peter Scott with Heinz Sielmann and Gerald Durrell.

H.M. King Leopold III arranged to celebrate a hundred years of Belgian rule in the Congo by sending a large team of scientists and technicians, under the auspices of the Fondation Internationale Scientifique, to film the wild life there. Heinz Sielmann, the director of the film, shows some of the material he shot and tells the story behind it. He also introduces a short excerpt from the British version issued by Twentieth Century-Fox under the title Lords of the Forest showing for the first time wild gorillas in their natural surroundings.
Appearing in the programme is N'Pongo, the baby gorilla from Gerald Durrell's Jersey Zoological Park.