31 sources Action ComicsAdventure Comics Detective Comics (vol. 1) #60 (Feb. 1942): "The Case of the Missing Evidence" Leading Comics More Fun Comics Real Fact Comics Slam-Bang Comics #6 (Aug. 1940): "The Floating Fortress" Star Spangled Comics #1 (Oct. 1941): "Ace-Deuce" Strange Adventures (vol. 1) #1 (Aug.-Sep. 1950): "Mr. Future" World's Finest Comics | 20 characters
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