S1, E3: Ian Thorpe, Ernie Dingo and Julia Zemiro have all donated their DNA so they can retrace their ancient ancestry. Having started out together in Africa, they're now making their way across the world on separate journeys. Ian's come to the grasslands of Kyrgyzstan in the former Soviet Union to discover how his forebears, to the west in the Russian Steppes, were part of a pivotal period of history. In Sardinia, Julia is taken to an archaeological dig and helps extract the tooth of her two and a half thousand-year-old ancestor. On the other side of the world Dr Mitchell is also plotting Ernie Dingos genetic route map. Next stop is Timor Leste. Here Ernie will learn about one of humankind's greatest ever achievements, the journey to arrive on the shores of Australia for the first time.