#OnThisDay in 1946 #SivanaJr debuted in #CaptainMarvelAdventures #comics #52 #ThaddeusBodogTheYounger son of #TheOriginalCaptainMarvel85’s #archEnemy & #WorldsWickestBoy studied #AncientAtlantisScrolls for a #failed40sPlot & also got pop & #ShazamFamily et al trapped in #Suspendium #for20years