September 2013. Two cavers inadvertently stumble across a cave containing bones nearly two million years old, belonging to an entirely new species of human ancestor. This two-hour special documentary, made by National Geographic Studios, chronicles one of the great fossil-finds of our time. Cameras were there filming as the discoveries were made and now this stunning find is rewriting the story of our human origins, filling in a mysterious million-year gap in the fossil record of our evolution. In that gap is the dawn of humanity. It covers the crucial transition from the ape-like Australopithecus to the first members of our own Genus, Homo the first humans. This is arguably the most important episode in our evolution.