They move through the alleys and across the rooftops of the city--mysterious shadow warriors unique in the history of ninjas. In this first issue of their new adventures, tying in with the brand new animated series, learn the story of two men: Officer Ronnie Callahan, a rookie cop, and his old friend, Kenzo. Friends in their youth, they've gone their separate ways: Ronnie to the NYPD, and Kenzo to the fearsome criminal organization known as the Foot. Their paths will cross this night, intersecting with enigmatic, turtle-shelled denizens of sewers and darkness whose activities will result in the death of one of the friends...and the rise of an old menace in the heart of the city.