It happened in North America before the arrival of pale-faced conquerors. The mighty chief of a Native American killed in battle the bear. His angry sons decide to take revenge on the beast. Younger brother, obsessed with revenge, decides to commit retaliation alone, but the forces of the forest magically transform himself into a bear. Seeing the world through the eyes of an animal, he learns a lot about the world and the interconnectedness of all living beings. But suddenly he also learns that his older brother, along with the best hunters of the tribe is going to destroy all the bears in the area ... which means that, too!