#OnThisDay in 1958 #CosmicBoy debuted in @DC.com #AdventureComics #247 #RokkKrinn #MagnoBallChampion of #30thCentury planet #Braal where natives have the #abilityToMagneticallyAttractAndRepelObjects #foundingMember and #1stTeamLeader of #TheLegionOfSuperHeroes gets solo mini-series in 1986
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