Batman: World Domination
Batman gets hit with a streak of darkness (moreso than usual), and thinks to himself that he's tired of the way the world is. Then he decides, that, with all the knowledge he has, heroes, villains, governments, etc., he gonna take over the world and "make it a better place", a la Doom. Now he knows he's gonna meet resistance, from friends and enemies alike, and he takes a few months preparing for his takeover, from teaming with old foes, like Ra's Al Ghul and Lex Luthor, to using his resources to make vast weaponry and any other things. And, he also knows he has time to take out most of the JLA members that would be considered threats, and make it look like any of the team's villains had done it while looking just as shocked as the rest. And, if he chooses, he can even make an alternate identity to deal with most heroes and most of the villains he teams up with so that no one he wants to know would know. Now, how far does he get before he's stopped, if he's stopped? And who's capable of stopping a determined and prepared Batman from taking over the world as he plans?