#OnThisDay in 1990 after #CrisisOnInfiniteEarths removed #Supergirl from #LegionHistory #LaurelGand of #30thCentury #Daxam debuted in @dc.com #LegionOfSuperHeroes #comics #6 unique #PowerGirl -level abrasive #SuperAdventurer & 1st post- #Watchmen #DCU character with #isolationist cultural parameters