Prehistoric fantasy. 12-year-old Pitt and his pterodactyl pal Kantrop try to help their tribe. Pitt invents the first currency - pearls! Soon, the pearl frenzy spreads within the tribe and Pitt's parents are heavily in debt. Grenella, who secretly found a cave full of pearl oysters, is striking rich and playing bachelorette. Can Pitt teach his tribe that pearls can't buy happiness?