Lord Marmaduke Ffogg has come to Gotham City, and he's brought a bit of old Londinium with him. Specifically, some of that city's famous fog! But this is no normal fog. His malicious mist may just find the entire populace saying "Gor Blimey!" Can Batman and Robin see their way clear to stop this cloudy culprit in time, or will the city swing like a pendulum, too?