#OnThisDay in 1977 #TheWonderTwins debutedOn #HannaBarbera’s #animatedSeries #TheAllNewSuperFriendsHour #ZanAndJayna #DonnyAndMarie-inspired #ExtraterrestrialTwins whoCanTakeOn #anyFormOfWater or #AnyAnimal respectively #whenMakingContact with eachOther & their #origin told in #SuperFriendsComicBook