The first crossover of the "Rebirth" era is here! As a huge storm approaches Gotham City, Batman, Batwoman and Nightwing try and prepare for the worst, but nothing can prepare them for enormous 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, Spoiler, Orphan and Clayface be enough? And who is the mastermind behind it all? Collects BATMAN #7-8, NIGHTWING #5-6 and DETECTIVE COMICS #941-942.