#OnThisDay in 1968 #JonnyDouble debuted in @DC.com #Showcase #comics #78 #OnceUponATimeInSanFrancisco #downOnHisLuck #privateEye who spends the #early70s in the eclectic company of #TheChallengersOfTheUnknown #Deadman #DianaPrinceWonderWoman #Supergirl & #Kobra