Set 6,000 years ago in prehistoric Europe, Wolf Brother follows 12-year-old Torak, who witnesses his father's death at the hands of a bear possessed by a malevolent spirit. With his dying words, Torak's father binds him to a quest: to find the mythical Mountain of the World Spirit and prevent the demon bear from destroying the world. Alone and vulnerable, Torak is joined by a wolf cub, forming a bond that transcends species. Together, they embark on a perilous journey through dark forests, facing dangers from both the natural world and other humans.