"DC Comics and IDW team up for the crossover event of the decade! Two of the most iconic entertainment icons meet for the first time in a tale that readers never imagined they would see. In Gotham City, a series of deadly raids leads Batman to believe he is up against a group of highly trained ninjas. As it turns out, the Foot Clan is on the loose. Somehow, they've crossed over to another dimension and are determined to take advantage of the situation while looking to get back home. But they haven't come alone: Leonardo, Raphael, Donatello and Michelangelo are on their trail. Get ready for excitement as an assortment of characters from both worlds clash and team up in an epic battle that threatens the very fabric of reality!"-- Provided by publisher.