#OnThisDay in 1965 #TheUnimaginable debuted in #JusticeLeagueOfAmerica #comics #42 #duringTheSameAdventure #Metamorpho #turnsDownTheTeamsOfferOfMembership this #incomprehensibleSuperBeingFromAnotherRealm petitions&is #turnedDownForJLAMembership #tormentsTheTeamAgainTwoIssuesLater