#OnThisDay in 1958 #TheLegionOfSuperHeroes debuted in #AdventureComics #247 when #SaturnGirl #LightningBoy #CosmicBoy members of a #superHeroClub #fromTheFuture visit #Superboy&tell him he inspired their union after putting him thru a series of tests & #offeringHimMembership regularCoverFeature 1963