Bob Castro appears in 12 issues.
Dr. Hugo Strange is a brilliant but disturbed psychologist with an obsessive vendetta against Batman. In addition to being one of Batman's earliest foes, preceding even the Joker and Catwoman, he is also one of the few to successfully deduce that Batman and Bruce Wayne are one and the same.
Solomon Grundy is a reanimated corpse stemming from a cursed place near Gotham City called Slaughter Swamp. He has had many appearances in which he had different levels of strength and intelligence, once surpassing even Superman in power level.
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