Batman is forced to fight his beloved sidekick and cures him back at the Batcave, following Two Face to the casino where he is in fact revealed to be Dent, having suppressed his bad side (* la Dr Jekyll and Mr. Hyde). Once the Dynamic Duo are strapped to a large silver dollar, he unmasks Batman and deduces Robin's true identity, then Two Face invites the Joker, Penguin, Riddler, Mr. Freeze, Egghead, Shame, Clock King and Catwoman to an auction for the highest bidder of Batman's true identity.
Batman
Two Face