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 alongside Hancock, is focused on the Americas and was released in October 2024. It incorporates the controversial Younger Dryas impact hypothesis, which has been comprehensively refuted.