The final episode explores the arrival of Homo sapiens in prehistoric Europe. The Neanderthals were already present on the continent, and the two species were similar enough to interbreed, but the influx of modern humans had dire consequences for their evolutionary cousins.
The migration of Homo sapiens into Asia is detailed. Recent evidence suggests the exodus from Africa began earlier than thought; and that ancient humans mated with another human species known as the Denisovans.
The appearance of Homo sapiens on the African landscape some 200,000 years ago is detailed. Scientists now believe that the early humans evolved in many places across the continent at the same time, not just in eastern Africa. Also: DNA evidence that early Homo sapiens inter-bred with other human species in Africa.
The story of early Homo sapiens and how they became the dominant human species begins with the colonization of the Americas. Included: an underwater discovery off Mexico that may mean humans arrived earlier than thought; and came by boat, not the foot.