BATMAN #13

Somewhere inside Gotham City Police Department headquarters, Vandal Savage hides a chemical weapon designed to kill Poison Ivy — but if Ivy dies, there will be no ending the bad night of Bad Seeds, for Gotham or anywhere else. No power, no comms, a heavily armed private militia ordered to bring him down by the worst person in Gotham, all holed up inside an impenetrable fortress. This sounds like a job for the Bat.