Twenty thousand years ago, our planet was not the friendliest place to live: people were forced to tirelessly roam the endless wastelands, hide from dangers in caves, and food was obtained exclusively by hunting wild animals. The main character is a young resident of one of the local tribes, relatively prosperous by the local standards. When the boy grew up, the father decided to teach his son to hunt, because without this it is impossible to survive and feed the future family, this is the true duty of a real man and a brave defender of the tribe.
However, the implementation of the plan is distorted: the boy fights off the main group, and, as a result of an accident, remains in absolute solitude, alone with the danger of impenetrable forests. The boy is seriously injured, but his fear is even more palpable: he has no idea how to find his way home, and also rightly fears a repeated attack by hungry predators. Having calculated all possible options in his head, he decides to move in the direction most similar to the way back, hoping to get to familiar places. The exhausted traveler is attacked by a pack of wolves, but by a miracle he manages not only to protect himself, but also to injure one of the attackers. But the young man does not dare to finish off the defenseless beast, not yet suspecting that the shown mercy will become the legendary beginning of the friendship between a dog and a person.