In James Cameron's 2009 film "Avatar," Sam Worthington plays Jake Sully, a jarhead military man who is capable at tactics and little else. When his consciousness is shunted into the body of a nine-foot cloned Na'vi, and he goes out onto an alien world to learn the Na'vi ways, he finds his mind expanding, and his hatred for the human world increasing. By the end of the film, he moves into his alien body permanently to live a vaunted position among them. The story is something straight out of...