This second episode of this fourth season of Gotham ends with young Bruce Wayne standing atop a rooftop, wearing a mask and a sort of dark costume, perusing the streets of Gotham, poised to swoop down and foil crime. It’s not quite the Batman costume – but it’s close enough for now, and it’s taken this prequel series several years to get here. Meanwhile, we also get closer to Catwoman and Poison Ivy – while the Riddler, for now, remains on ice. Frozen by Penguin…