Graham Hancock presents pseudoarchaeological theory that there was an advanced civilization during the last ice age and that it was destroyed as a result of meteor impacts around 12,000 years ago. He argues that the survivors passed on their knowledge to hunter-gatherers around the world, giving rise to all earliest known civilizations. The first season of the series, produced by ITN Productions, was released on Netflix in November 2022. A second season, featuring actor Keanu Reeves, is focused on the Americas and was released in October 2024.