#OnThisDay in 1968 #TheDarkCircle debuted in #AdventureComics #367 #mysteriousNefariousOrganization thatAttacks #30thCenturyEarth & #TheLegionOfSuperHeroes & #TwoYearsLater in #ActionComics #TheTeenSuperTeamFromTheFuture #fightFireWithFire setting #TheLegionEspionageSquad againstTheirActionOnPeralla