Detective Comics #210

A criminal known as "Brain" Hobson is executed by electric chair, but shortly after the execution his body is snatched away from the prison's morgue. After this event, the underworld of Gotham City learn that thanks to some advanced technology, Hobson's consciousness is still alive as his brain had been placed on a tank filled with a special electro-chemical liquid. Batman and Robin start investigating the case as crime increases in Gotham. After an extensive investigation, the Dynamic Duo locate the hideout of the criminals, where they uncover the whole brain scheme as a giant hoax in order to gather the largest group of criminals in the city and make off with the ensuing crime spree's loot before anyone is the wiser. After capturing the thugs and delivering them to the police, Batman and Robin return to the Batcave carrying the fake brain for their Trophy Room.