ACTION COMICS (1938) #434
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Cover by Nick Cardy. "The Krypton Connection!", script by Cary Bates, pencils by Curt Swan, inks by Vince Colletta; The Kryptonians Dr. Xadu and Zeda trick Clark Kent into a dentist chair where they reveal that they have returned to Earth and have placed Superman under their control. "Zatanna's Double Identity!", script by Elliot S! Maggin, pencils by Dick Dillin, inks by Frank McLaughlin; Zatanna accidentally gives herself the powers and personality of Black Canary, causing Green Arrow problems when the real Black Canary becomes jealous.