Batman and Robin arrange for the Joker's former confederate, Venus, to stay at an apartment while they figure out what to do next. Meanwhile, the Joker has freed the Penguin from Gotham State Prison to continue their crime wave. The Joker tricks Venus into asking Batman to take her to the Batcave.

Catwoman offers to free Batman if he joins her. He agrees but secretly takes a Universal Batantidote before Catwoman uses cataphrenic. Batman goes with the gang to visit Little Al at the Old Criminal's Home to buy the plans to the Mint, and manages to phone an anonymous tip to the cops leading to the capture of Robin and Pussycat. Catwoman then talks Batman into taking her to the Batcave.