Journey of Man answers the question "Where do we all come from?" Today, some six billion people are spread across the planet. But there was a time - not so long ago - when the human species numbered only a few thousand and their world was a single continent: Africa.

Then something happened. A small group left their African homeland on a journey into an unknown, hostile world. Against impossible odds, these extraordinary explorers not only survived but went on to conquer the earth. Their story can finally be told through the science of genetics. Dr. Wells, a 33-year-old geneticist, is part of a team that has been re-writing history. He has been disentangling this epic story from evidence all people carry with them - in their DNA - inherited from those ancient travelers.

Wells travels to every continent in search of the people whose DNA holds humanity's secret history; the Namibian Bushmen, the Chukchi reindeer herders of the Russian Arctic, Native Americans and Australian Aborigines.