#onThisDay in 1975 #PowerGirl debuted in #AllStarComics #58 #Earth2 #SupermansCousin #inASingleBound steps into #TheSuperSquad nee #TheJusticeSocietyOfAmerica via #WallyWood #LittleAnnieFannyFromKrypton but w #BenGrimm’s haymaker & attitude 1977 gets 3 issue #Showcase run #postCrisis #AtlantisOrigin