#OnThisDay in 2007 @dc.com post-52 the #weekly @pauldini.bsky.social & Co #Countdown #comics series debuted with #51 & #countingDownBackwards to #DCUniverse #0 as a #FinalCrisis prelude #Darkseid #DonnaTroy60 #JimmyOlsen #JasonTodd #KarateKid #KyleRayner #MaryMarvel #TheTrickster #PiedPiper #TheAtom