Episode 1 – "Hunt or Be Hunted" This episode shows how we humans started out as prey for other animals such as saber-toothed cats. It depicts a saber-toothed cat killing a chalicothere and leaving the remains of the carcass, our ancestors attempt to steal the remains from the cat and one of the group is killed as the saber tooth spots them. It also shows how we discovered tools and made use of the sharpened stone. Later the show showed how as we grew more intelligent, that we were able to turn the tables on the beasts.[clarification needed]
Episode 2 – "Mastering the Beasts" Takes place during the Ice Age, it shows how the Cro-Magnon and modern humans have become the dominant species and how we hunted animals such as mammoth, Irish elk, aurochs and buffalo. Threats however include giant cave bears and wolves. Death on the tundra was common and to survive our ancestors need to be able to adapt to change, such as the warming of the earth at the end of the last Ice Age ... something most of the giant beasts could not do, and therefore suffered extinction.