#OnThisDay in 1964 #CompositeSuperman debuted in @DC.com #WorldsFinestComics #142 #JoeMeach takes #Superman’s #SupermanMuseumJanitor job offer but resentfully he rages near #TheLegionOfSuperHeroes display #duringALightningStorm & #gainsAllTheirPowers & #deciphersSupermanAndBatmansSecretIdentities