#OnThisDay in 1988 #The3partCrisisEvent @dc.com #Invasion! #comics #1 debuted with #20thCentury #DCU earth facing an #AlienInvasion led by #30thCentury #LegionOfSuperHeroes adversaries #TheDominators & #TheKhunds #Australia is heldHostage & #TheDailyPlanet headline posts #EARTHTOINVADERS: #DROPDEAD!