ener ation , ▁while ▁in ▁The ▁Five ▁Do ctors , ▁Bor usa ' s ▁prize ▁of ▁imm ort ality ▁results ▁in ▁little ▁more ▁than ▁a ▁living ▁death . ▁The ▁horror ▁of ▁et ernal ▁life ▁is ▁brought ▁home ▁when ▁the ▁Black ▁Guardian ▁threat ens ▁T url ough ▁with ▁imm ort ality ▁as ▁a ▁pun ishment ▁for ▁failure , ▁something ▁that ▁drives ▁him ▁to ▁try ▁and ▁commit ▁suic ide ▁rather ▁than ▁face ▁et ern ity . ▁ ▁Broadcast ▁En light en ment ▁was ▁first ▁broadcast ▁in ▁a ▁twice - week ly ▁slot ▁on ▁BBC ▁One ▁during ▁the ▁first ▁two ▁weeks ▁of ▁March ▁ 1 9 8 3 . ▁The ▁story ▁episodes ▁aver aged ▁ 6 . 8 ▁million ▁view ers , ▁with ▁the ▁highest ▁view ing ▁figures ▁being ▁ 7 . 3 ▁million ▁for ▁the ▁final ▁episode . ▁The ▁episodes ▁aver aged ▁ 6 7 . 5 % ▁on ▁B AR B ' s ▁App reci ation ▁Index , ▁with ▁Part ▁Four ▁once ▁again ▁ach ieving ▁the ▁highest ▁figures . ▁ ▁Archive ▁The ▁BBC ▁holds ▁all ▁four ▁episodes ▁on ▁D - 3 ▁t ape , ▁transferred ▁from ▁the ▁original ▁ 2 " ▁vide ot apes . ▁ ▁Re ception ▁Review ing ▁the ▁story ▁for ▁Doctor ▁Who ▁Magazine ' s ▁ 2 0 0 ▁Golden ▁M om ents ▁special ▁edition , ▁Jer emy ▁Bent ham ▁described ▁it ▁as ▁being ▁ep ic ▁in ▁scale , ▁suggesting ▁it ▁played ▁to ▁the ▁original ▁strength s ▁of ▁the ▁series ; ▁" per formance , ▁period ▁set ▁design ▁and ▁cla ust