S1, E3: A group of Cro-Magnon is migrating. Are these people descendants of the Neanderthal men, or their cousins, invaders or their conquerors? Among them we find the prototypes of our heroes: Peter - solidly built, Jumbo - indestructible, Pest - forever dissatisfied, Pierrette - charming and pretty, Maestro - the wise man with the long, white beard. At the encampment, under the guidance of Maestro, the young boys are making tools by striking and shaping stones. Meanwhile the older ones, the hunters, come back empty-handed from the hunt, because the herds have gone far off and are migrating. They decide to break camp and follow them. On their way they meet another tribe whose chief is Pest. Impressed by the implements the boys have made, he offers to give them a large number of mammoth skins in exchange. This barter is done, and the tribes go their ways before finding a site for the new encampment...