Detective Comics #305

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“TARGETS OF THE ALIEN Z-RAY.” Two bank robbers force two aliens on Earth to give them the secrets of a Z-Ray, which kills by delayed action, and use it against Batman and Robin. However, the alien tricks the crooks by altering the killing ray to make it harmless, so that the Dynamic Duo could capture the criminals, who become overconfident using the alien weapon. After the crooks are captured, the aliens return to their home planet.