Sariac, who left to attend the wedding of the bear chief's son, forgot to name a chief by default. Now every Pitek wants to take the vacant chief's seat! To avoid a civil war, Pitt invents the majority vote, and his dad is elected!
A charming but exhausted cave woman is rescued in the wild by Pitt and Kantrop, who bring her back to the Pitek village. Little do they know that their guest is indeed a spy and a scout, on a mission to bring discord into the village.
Much to Pitt's surprise, Prosper introduces Pitt at a shaman's reunion as the apprentice he was supposed to train for a year! Pitt has to play along to protect Prosper, whose knowledge and power amount to zero.
After a couple of unfortunate disasters occurring while Pitt was present, everybody thinks Pitt brings bad luck to the tribe. Pitt has to prove his tribe wrong. But the more he tries, the more they're convinced he's responsible for everything!
Pitt has saved Sariac's life. According to the tradition, the Big Chief adopts him as his son. But life in Sariac's hut is far from a picnic. Between the household chores and the learning of his one day chief-to-be status, Pitt misses his own family.
The tribe's best hunters are losing stamina: they can't even catch dodo birds any more! Pitt convinces them to get some exercise by running after an inflated skin. Soon, he has to make up rules, and sport is born for the first time in history!
Liane cooks the miserable results of Stef's hunt (a mouse and a bunch of leaves). The aroma smites the whole tribe. Pitt sees this as a way to save his dad from the hunting chore: Liane will trade her cooking against some of the other hunter's game.
A huge chasm has appeared in the middle of the village, dividing it in two halves, with tribe members on each side. Pitt invents the postal service with Kantrop, to transmit spoken messages and parcels to each side.
Stef promises Sariac a new hut for his birthday. Kantrop ends up hauling the stones for its construction on the flank of the mountain. To alleviate his burden, Pitt invents the wheel. But Kantrop's loads are doubled!
Sariac, stuck into his new bison headdress, can't see a thing. Fearing to be ousted if caught in such ridicule, he leaves the village guided by Prosper, while Pitt will have the Chief's cousin (a dead-ringer for Sariac) impersonate him.
Pitt invents the first currency - pearls! Soon, the pearl frenzy spreads within the tribe, and Pitt's parents are heavily in debt! Meanwhile, Grenella, who secretly found a cave full of pearl oysters, is striking rich and playing bachelorette!