The inside story of a remarkable anthropological find - the discovery of living human quadrupeds in a remote part of Turkey.
Filmed in secret over the past year, the programme is an intimate portrait of an extraordinary family, and an examination of the intense scientific debate the familys existence has fuelled.
This could be hugely important from the point of view of telling the evolutionary history of our species, says Professor Nicholas Humphrey, one of the scientists leading the research into the family.
But the only thing the scientists agree on is that this is not a hoax. American paleoanthropologists think their skeletons could hold vital clues about the origin of man. A Turkish neurophysiologist believes they are wholesale genetic throwbacks - a living missing link. German geneticists believe that they hold the key to a breakthrough gene for bipedality. UK researchers, though, contend that no single faulty gene could produce the first human quadrupeds the modern world has ever seen.
They raise profound questions about what it is to be human, says producer Jemima Harrison. They walk like animals and thats very disturbing at first. But we were also extremely moved by this family's warmth and humanity.
Subtitles Stereo Widescreen