Batman and Robin meet Gotham District Attorney Harvey Dent at a top-secret demonstration led by Hugo Strange and Dr. Harleen Quinzel. Alfred Pennyworth, Bruce Wayne's loyal butler, watches from the wings, offering calm commentary and gadgets. The event centers on the Evil Extractor, a machine built to siphon evil from criminals and store it in a containment vat. When the vat explodes, Dent is drenched in liquefied evil, his face scarred on one side and his personality fractured, transforming him into the criminal known as Two-Face. Dent’s arc plays out across confrontations with Batman and Robin, punctuated by brief moments of restraint and renewed crime, until a reconstructive procedure seems to erase the dual persona and allows him to resume crimefighting as the assistant to the Assistant District Attorney.
Six months later, Batman and Robin collar King Tut and his henchmen for stealing a biplane. Batman, Robin, Commissioner Gordon, and Chief O'Hara interrogate Tut's alter ego, Professor McElroy, with O'Hara repeatedly tapping the professor on the head to swap personalities. At his trial, McElroy admits guilt and hints at a rehabilitation-oriented sentence, a theme that echoes the uneasy relationship between justice and reform. After the sentencing, Bruce Wayne shares a highball with Dent at a charity for underprivileged twins held at the Winning Pair casino, a moment that underscores the fragile balance between their two worlds.
A package arrives at Gordon's office: a World Atlas book whose pages have been gnawed away in three holes. Batman and Robin deduce that the missing pages point to duality and a bookish culprit, turning their suspicions toward Bookworm. The investigation leads them to an abandoned sign factory where Two-Face and his henchmen lie in wait. After a ruthless showdown, Two-Face pins Batman and Robin with a large numeral two and watches as the coin flip lands on the right side, sparing their lives. Batman theorizes that Dent’s collapse has drawn together a coalition of criminals who seek to exploit his dual identity for their own ends.
Back at the lab, Robin is ambushed by Two-Face. Hugo Strange uses his liquid evil to hypnotize him, forcing Batman to confront and subdue the mentally compromised partner. Robin is cured in the Batcave, and the chase resumes as Batman and Robin follow Two-Face to the Winning Pair Casino, where the villain is finally unmasked as Dent. Dent invites several other villains to bid for knowledge of Batman and Robin’s true identities, a chilling gambit that tests the heroes’ trust in each other.
With Catwoman on their side, Batman and Robin mount a coordinated assault to outwit the assembled criminals. They manage to disable the alliance, but Two-Face escapes aboard the biplane Tut stole, using the evil gas to corrupt the citizens of Gotham. Batman, with Dent regaining some self-control, defeats the dual persona once and for all as they pull away from the factory to safety.
The next morning, Batman and Robin deploy the Batwing to help cure the infected citizens and begin the long process of healing the city’s psyche. Months later, Harvey Dent hosts a bachelor auction at Wayne Manor, with Batman as the first bachelor, a symbolic reversal of Dent’s former power and a sign of Gotham’s slow return to balance. The scene underscores the lingering shadows of Dent’s past and the fragile hope for a future where duality no longer governs his actions.
In a Blu-ray-exclusive scene, Harleen Quinzel is shown breaking the Joker out of prison while wearing her own costume, revealing the early spark of her eventual transformation into Harley Quinn. The moment adds a postscript to Quinzel’s arc, hinting at a broader rogues’ gallery and the evolving dynamics that shape Gotham’s crime-fighting landscape.
