Rocky is ten years old, and he is the most ordinary boy who loves active games, a little mischievous and often gets into the most adventurous stories. There is only one small detail. The thing is that Rocky is a Cro-Magnon and was born as far back as 3500 years ago, when the ancestors of modern humans lived in caves! The boy was due to undergo an important initiation rite that symbolized the end of childhood and the beginning of the path of a brave hunter. The impatient Rocky rushed to his ceremony, deciding to cut across a frozen lake. The ice turned out to be not very strong, and at one moment Rocky found himself in the cold water, where the water could freeze in an instant. In the 21st century, archaeologist Mary Tika finds the boy in a block of ice and decides to adopt the ancient baby. Thus, Rocky becomes a new member of a noisy family: he now has a brother Theo and a sister Luna. Together with them the boy lives in a cozy house on the edge of town, and every day Rocky is filled with adventures, because it is not easy for him to get used to life in the modern world!