Day of Vengeance
Most of us would probably agree that making Superman angry is not the best career move. But in Bill Willingham's Day of Vengeance, that's exactly how the vengeful spirit Eclipso forces his wicked way into the mind and body of the Man of Steel in order to take over the world. (All supervillains want to take over the world. Why? What will they do with it then?) In this cross-pollinated book, part of the excellent series Countdown to Infinite Crisis, the gorgeous color artwork complements a scary storyline and appearances by many in the vast pantheon of superheroes, including even the wizard Shazam. The Infinite Crisis story arc, which also includes the excellent The OMAC Project, deals with the fragility of identity, so all the main good guys end up doing evil deeds, and not always because they've been possessed by demons.