Teenagers in Gotham, exploring a dark bat cave where kids would hang out, drink and be up to no good... What could go wrong? Oh yeah, Francine Langstrom and her swarm of crazy man-eating bats. THEY DEAD! And not long after James Gordon tells Batman about more missing people, Bruce is soon on the trail of Kirk Langstrom.
Bruce finds Kirk flying through Gotham, and uses some sonics to bring him down. While Bruce catches Kirk with the aid of a jetpack, Kirk eventually wakes up, biting him, and bringing them crashing down into a nearby apartment, where Bruce tries to reach Kirk deep down inside of Man-Bat, while using some sonics and frequencies to calm the beast.
Bruce's plan eventually works, and Kirk reverts back to his human form. Kirk is weak, but manages to tell Bruce about his "wife" and the fact that they don't need the serum anymore to transform. Kirk brings back Batman to his old lab, and they come up with a plan to try and inject Francine with a serum that would counteract the DNA alterations which were allowing her to control a flock of bats she infected with her blood. Bruce is skeptical of the plan, but goes along with it anyways.
Outside Francine's cave, Bruce injects Kirk with a mild sedative to keep him calm, because Bruce needs him in his human state. They venture into the cave, using sonics to keep Francine's bats away from them, but there are too many, and they begin to swarm Kirk, who drops the serum, believing the plan is doomed.
Well, this isn't news to Bruce, who knew the plan was crappy to begin with, aware that a simple syringe wouldn't be able to pierce Francine's thick hide, but Man-Bat's teeth could. Turns out Bruce never dosed Kirk with a sedative, but the serum instead, knowing that Kirk would transform and end up breaking Francine's skin at some point. Once he does, Bruce knocks out Kirk before he can kill Francine, and delivers them both to Arkham, where Kirk gives himself up willingly, Francine, not so much.
The next morning, Alfred asks how Bruce's night was, to which he says it was uneventful... But Bruce's new partner, Catwoman who is actually Catbird is pretty pissed she wasn't invited OH MY GOD GOTHTOPIA!
ONE FINE DAY WITH A TWEET AND A PURR
A BABY WAS BORN AND IT CAUSED A LITTLE STIR
NO BLUE BUZZARD, NO THREE-EYED DOG
JUST A FELINE AVIAN LITTLE CATBIRD
CATBIRD! CATBIRD! ALONE IN THE WORLD IS A LITTLE CATBIRD!