Detective Comics #471
Bruce Wayne checks into the private hospital Graytowers to recover from injuries he sustained fighting Dr. Phosphorus, but he soon discovers that Hugo Strange is using the facility to turn the rich and influential patients into his mindless slaves. When Strange sics a venomous snake on Batman, which knocks the hero out, Strange uncovers Batman's secret identity.
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Bruce Wayne checks into the private hospital Graytowers to recover from injuries he sustained fighting Dr. Phosphorus, but he soon discovers that Hugo Strange is using the facility to turn the rich and influential patients into his mindless slaves. When Strange sics a venomous snake on Batman, which knocks the hero out, Strange uncovers Batman's secret identity.
Plot details indexed by the Grand Comics Database (CC BY-SA).