#OnThisDay in 1963 #SatanGirl debuted in @DC.com #AdventureComics #313 when #RedKryptonite-exposure in #The30thCentury splits off an #EvilClone of #Supergirl who #inDisguise petitionsFor #LegionOfSuperHeroes membership after infecting #allTheFemaleMembersOfTheTeam w Red K poisoning/menstrual analogy