The Incredible Human Journey is a five-episode science documentary and accompanying book, written and presented by Alice Roberts. It was first broadcast on BBC television in May and June 2009 in the UK. It explains the evidence for the theory of early human migrations out of Africa and subsequently around the world, supporting the Out of Africa Theory. This theory claims that all modern humans are descended from anatomically modern African Homo sapiens rather than from the more archaic European and Middle Eastern Homo neanderthalensis or the indigenous Chinese Homo pekinensis, and that the modern African Homo sapiens did not interbreed with the other species of genus Homo. Each episode concerns a different continent, and the series features scenes filmed on location in each of the continents featured. The first episode aired on BBC Two on Sunday 10 May 2009.