The Joker. Hugo Strange. Bane. Leviathan. Doctor Simon Hurt. All of these villains are seriously contenders for the greatest adversary to Batman, and yet, none a one of them can claim it. Oh sure, they’ve all done some incredibly crippling (some literally more than others) acts of terror to the Caped Crusader, but when it comes down to it, they’re not the worst enemy of dark vengeance.
No, that would be Captain Paul Starks of the Montgomery County (Maryland) police department.