Batman: Battle for the Cowl: Man-Bat (2009-) #1

Gotham City is in chaos and the villains of Arkham Asylum are running amok. Doctor Phosphorus seeks out another scientist to help him grow even more powerful. But when that scientist is Kirk Langstrom, a.k.a. Man-Bat, Doctor Phosphorus—and all of Gotham—will get much more than they bargained for!