After meeting a good-natured inter-dimensional time traveler named Renet, the Turtles become unstuck in time and go spinning into the past! Meanwhile, Shredder and Krang finally meet up, but will they be able to overcome their differences to join forces? And, Old Hob has perfected the art of making mutants! Plus, when a new invention goes haywire, the Turtles are sent to a whole new type of New York City. One with a whole lot more ghosts–and Ghostbusters! Collects Turtles in Time, issues #38–44 of the ongoing series, and the TMNT/Ghostbusters crossover.