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I'd say the seeds were planted at least as far back as the Adam West Batman series. He always had the right gadget to get him out of a death trap, he always knew that obscure piece of trivia that lead to the villains downfall, he and Robin could takeout a room full of goons with nothing more then their fits, etc. Though I don't think things got completely ridiculous until around the time Batman started keeping detailed lists on how to kill his fellow super heroes should they ever go rouge.
Though "normal man with extreme knowledge, intelligence and fighting prowess" is nothing new. Sherlock Holmes was doing it 52 years before Batman
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