The first crossover of the "Rebirth" era is here! As a huge storm approaches, Batman, Batwoman, and Nightwing try and prepare Gotham City for the worst, but nothing can prepare them for enormous tall monsters rampaging through the streets! Batman will need all of his allies to unite in order to stop these mad science monsters from tearing their city apart! Will the Dark Knight, Batwoman, Nightwing, Robin, Spoiler, Orphan and Clayface be enough? And who is the mastermind behind it all? Breakout writer Tom King THE SHERIFF OF BABYLON teams with writers Steve Orlando MIDNIGHTER, Tim Seeley GRAYSON and James Tynion IV BATMAN/TMNT for this epic crossover event! Collects BATMAN #7-8, NIGHTWING #5-6 and DETECTIVE COMICS #941-942.