A Zero Hour crossover issue. While on patrol, Batman and Robin stumble across the Joker being captured by Batgirl. Batman and Robin are shocked, considering the fact that Batgirl, aka Barbara Gordon, was shot and paralyzed by the Joker years ago. Upon entering the confrontation, the dynamic duo finds that they have entered a parallel version of Gotham: one where James Gordon was shot by the Joker during the Killing Joke and where now-commissioner Harvey Dent has outlawed vigilantism. As the Joker plans his caper to take out Dent, Batman finds that he can still contact the real Barbara Gordon (aka Oracle). Realizing that something bigger is happening, Batman nevertheless stops Joker’s plans. He finds that some of time has been restored, but that this alternate version Batgirl remains. Unsure what is happening, Batman contacts Superman.