During a commando operation carried out by an animal rights organization in a biological research institute, a pregnant chimpanzee is discovered, which will give birth to a "humanzee", a half-human, half-chimpanzee being. Named Charlie, he is raised by human parents for fifteen years. Neither human nor animal, his behavior and his sensitivity will create sparks within the community. But Charlie is unaware that elsewhere, a group of vegan activists seek to make of him their emblem.