A group of field researchers encounter a series of typical problems while surveying the Sahara desert — snake bites, thieving natives, automobile break-downs, dehydration, sand storms. They lead a nomadic tribe to a fresh water-hole, cure one of its sick children, then teach them to plant seed and irrigate. All of this adds up to much less drama than it suggests, due to the documentary-like style of filming. There are no safari hunts or wild animal stampedes, and very little plot. The best thing about this is Jon Pertwee, who had just finished playing the 3rd Doctor Who, as the grizzled safari guide whose experience saves the group from several predicaments. Filmed entirely on location in Africa.