One day a little boy is wandering along in a dark forest when he trips, stumbles and falls ... into the Stone Age! He meets a strange, mysterious girl his own age called Om and her tribe. Rather than being worried, the young boy is excited by his time-travelling adventure. He learns all about the tribe’s way of life. He watches them make tools, clothes, jewellery and weapons. He sees how they hunt, cook, celebrate – and even how they paint on the walls of caves. But when a big furious cave bear attacks, he wakes up back in his own time where everyone tells him it was only a dream. But was it?