Thirty-five thousand years ago in Southwest France, the setting of this dramatized documentary, lived one of the most successful human species ever: the neanderthal.
For 250,000 years they dominated Europe, a continent ravaged by ice ages and stalked by predatory animals.
Then 35,000 years ago they faced the ultimate challenge: the arrival of another human species. This is the story of the last time two different species of human shared the planet.
Only one of them would survive.