In this final episode, Ian's in the grasslands of Kyrgyzstan in the former Soviet Union to discover how his ancestors' horse-taming skills and the invention of the wheel changed the course of human history. Julia Zemiro's father's ancestors were on the beautiful island of Sardinia, off the west coast of Italy. Ernie Dingo's genetic map leads him to Timor Leste, where he learns of humankinds' greatest ever achievements - the journey to arrive on the shores of Australia for the first time.

• Julia Zemiro
• Ernie Dingo
• Ian Thorpe