The Mad Hatter has a superb collection of stolen hats, but with Batman's cowl missing it is incomplete. The Dynamic Duo must then thwart a number of schemes designed to part the Masked Manhunter from his cowl.; When theatrical lighting director Garfield Lynns is prevented from staging his first robbery, he makes his escape thanks to the light given off by a firefly. Inspired, he assumes the identity of the costumed criminal, Firefly.; The Clown Prince of Crime recruits some new members for his gang, all of whom are perfectly suited for specific felonies.; Executed criminal George 'Boss' Dyke's brain is transplanted into a gorilla's head, after amassing a fortune from his crimes, his next plan is even more bizarre. He intends to transplant his brain again, but this time into Batman's head!; Ventris, a convict, escapes jail with the help of a broken mirror. He adopts the identity of the Mirror Man and sets out to uncover Batman's secret identity by using his X-Ray Mirror.; A freak accident gives police janitor Barney Barrow a super advanced brain, he then blackmails the Dynamic Duo into aiding him with his ever more dangerous methods of crime fighting.; Actor Paul Sloane is disfigured in an accident, this unhinges his mind and causes him to turn to crime as the second Two-Face.