The heroes, villains, and monsters portrayed in such popular science fiction television series as Heroes, Lost, Battlestar Galactica, Caprica, Doctor Who, and Torchwood, as well as Joss Whedon's many series, illustrate a shift from traditional, clearly defined characterizations toward much murkier definitions. Traditional heroes give way to "gray" heroes who must become more like the villains or monsters they face if they are going...