Frank, an 11-year-old boy, was transported back into prehistory, far from his best friend and his daily routine. With a prehistoric girl of his age named Kenza and Mouthy the baby mammoth, he bravely faces (well, not quite) the hair-raising challenges and surprises of this unique world and has to adapt, despite the bumpy road of pre-adolescence, to family life in a tribe that is as brutish as it is charming.