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Due to running time constraints, Mann couldn't include footage with musician Frank Zappa, Scrooge McDuck creator Carl Barks, All American Comics editor Julius "Julie" Schwartz
Hop Harrigan was technically not a true superhero (as he had no costume or special powers) though he did meet the Justice Society of America in All American Comics #8, and he did eventually become a superhero from All American Comics #25 (April 1941) to #28 (July) as the costumed Guardian Angel.