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Doctor Death is Karl Hellfern, a mad scientist and supervillain who fights against the Batman in Gotham City. His plots usually revolve around lethal chemicals and biological weapons, as he is a brilliant and completely amoral chemist. He has been a member of the Science Squad on Oolong Island. The New 52 reboots Doctor Death as a scientist who developed a bone-growth serum that turned him into a disfigured monster. Doctor Death was created by Gardner Fox and Bob Kane, first appearing in Detective Comics #29. (1939) ||