Gotham’s “Mad City” arc continues with “Time Bomb.” It does a very interesting job of weaving together several different plot threads, and setting up for some serious conflict later. And, while they’ve hinted at it before, we see some more of the dark, twisted, brilliance that will eventually make Edward Nygma one of Batman’s more intelligent foes (in the comics at least, I’m not sure any of that happens in this reality).