Remember how Killer Croc turned into giant beast during that arc with Wonder Woman? Whatever happened to that? Well, he did major damage to the city, but in the chaos, he was overlooked, and instead of ending back up in Arkham, he was taken in by those animal creature members of the Religion of Crime... He also showed up in Katana? But screw that noise. While under the protection of the RoC, while he healed, Croc took a liking to scaly lady named Claire, who took a liking to him too.
Once Croc is finally healed, one of the RoC members speaks with him, about the people who now lives with, how they can transform into their animal shapes. Croc doesn't think he's like them, but this guy manages to convince Croc that he is, that he's much greater than them all, that the Hydra is his transformation. He wants Croc to lead the sect of the RoC, but first, he must kill Batwoman with a ceremonial blade.
Croc gets a tip that Maggie Sawyer has Batwoman's scent all over her, so he thinks that Maggie could possibly be Batwoman, and stakes her out, and is quite a bit surprised to find Maggie lock lips with Batwoman. Nevertheless, he spots his prey, and attacks. Unfortunately for Croc, he things Batwoman will just protect Maggie, but Maggie doesn't quite need any protection, and opens fire on Croc, but her handgun bullets don't do much... but the shotgun in her car does.
The blast to the back/neck of Croc wakes something up inside of him, the Hydra. The beast inside him has once again awakened, as he starts to hear his name "Waylon" called to him over and over again. Croc struggles to repress the Hydra, and starts to lose it, but nevertheless continues to attack. Croc finally comes to his senses once Hawkfire shows up, and he realizes if he kills Batwoman, it's not going to stop, there will be a reckoning, and more heroes will come after him. Croc comes up with a distraction, and makes his escape, all while flashing back to his first kill as a boy.
When he returns to the RoC's base, the guy who gave him the task of killing Batwoman asks if he was able to accomplish his feat, but Croc has a beter idea, and impales the dude, claiming he's going to get them all killed. Croc then embraces his new love Claire (with quite the belly) and tells her that they're getting out of Gotham.