Two adventurers, Bill Schindler and Cat Bigney, travel for 35,000 miles - from the cradle of civilization to the New World - as they complete challenges. While retracing the migratory route of our ancestors, our competitors must overcome some of the same oppressive deserts, frozen tundra and intimidating jungles. Along the way, they face the same challenges early humans did: building weapons out of stone, starting fires, hunting for food, communicating with local tribes and more.