ute ▁episode ▁deb uted ▁on ▁the ▁Du Mont ▁Television ▁Network ▁on ▁T ues day , ▁November ▁ 1 8 , ▁ 1 9 4 7 . ▁The ▁Ste ar ns es ▁created ▁and ▁wrote ▁all ▁the ▁scripts . ▁The ▁program ▁was ▁broadcast ▁live , ▁most ▁of ▁the ▁action ▁taking ▁place ▁on ▁a ▁set ▁representing ▁the ▁New ▁York ▁City ▁a partment ▁of ▁the ▁title ▁characters , ▁a ▁young ▁married ▁couple . ▁ ▁Mary ▁Kay ▁and ▁Johnny ▁was ▁the ▁first ▁program ▁to ▁show ▁a ▁couple ▁sharing ▁a ▁bed , ▁and ▁the ▁first ▁series ▁to ▁show ▁a ▁woman ' s ▁pre gn ancy ▁on ▁television : ▁Mary ▁Kay ▁became ▁pre gn ant ▁in ▁ 1 9 4 8 ▁and ▁after ▁un success fully ▁trying ▁to ▁hide ▁her ▁pre gn ancy , ▁the ▁produ cers ▁wrote ▁it ▁into ▁the ▁show . ▁On ▁December ▁ 3 1 , ▁ 1 9 4 8 , ▁the ▁Ste ar ns ' ▁weeks - old ▁son ▁Christopher ▁appeared ▁on ▁the ▁show ▁and ▁became ▁a ▁character . ▁ ▁After ▁a ▁year ▁on ▁Du Mont , ▁the ▁show ▁moved ▁to ▁CBS ▁for ▁half ▁a ▁year , ▁much ▁of ▁the ▁time ▁being ▁broadcast ▁every ▁week night , ▁then ▁ran ▁for ▁another ▁year ▁each ▁Saturday ▁night ▁on ▁N BC , ▁where ▁it ▁deb uted ▁on ▁October ▁ 1 0 , ▁ 1 9 4 8 . ▁It ▁broadcast ▁the ▁final ▁episode ▁on ▁March ▁ 1 1 , ▁ 1 9 5 0 . ▁ ▁View ership ▁At ▁a ▁time ▁when ▁there ▁were ▁no ▁TV ▁ratings