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Detective Comics#217
Cover: Win Mortimer
Detective Comics #217
“The Mental Giant of Gotham City!”
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Wanting to be a Policeman terribly, young Barney Barrows discovers that he can't pass the mental test to become one. However, a freak explosion in the Police lab exposes Barney to radiation which swells his mental capacity and head. He figures out Batman's true identity and forces the Caped Crusader and Boy Wonder to do his bidding.
Plot details indexed by the Grand Comics Database (CC BY-SA).