X-Men is one of the most popular comic book franchises ever, with successful spin-offs that include several feature films, cartoon series, bestselling video games, and merchandise. This is the first look at the deeper issues of the X-Men universe and the choices facing its powerful "mutants," such as identity, human ethics versus mutant morality, and self-sacrifice. J. Jeremy Wisnewski (Oneonta, NY) is Assistant Professor of Philosophy at Hartwick College and the editor of Family Guy and Philosophy (978-1-4051-6316-3) and The Office and Philosophy (978-1-4051-7555-5). Rebecca Housel (Rochester, NY) is a professor at Rochester Institute of Technology, where she teaches about writing and pop culture. For William Irwin's biography, please see below.