▁film ▁is ▁known ▁to ▁have ▁been ▁destroyed . ▁ ▁The ▁result ▁of ▁all ▁this ▁is ▁that ▁only ▁ 1 6 ▁episodes ▁remained ▁in ▁the ▁arch ives ▁when ▁the ▁BBC ▁real ised ▁the ▁value ▁of ▁such ▁material , ▁including ▁the ▁first ▁and ▁last ▁episodes ▁in ▁broadcast ▁order . ▁These ▁were ▁mainly ▁in ▁the ▁form ▁of ▁ 3 5 mm ▁film ▁tel ere cord ings , ▁with ▁a ▁hand ful ▁of ▁episodes ▁as ▁ 1 6 mm ▁film ▁record ings ▁or ▁reduction ▁prints . ▁In ▁the ▁case ▁of ▁some ▁episodes , ▁the ▁ 3 5 mm ▁location ▁foot age ▁also ▁exists , ▁and ▁has ▁been ▁used ▁to ▁rem aster ▁those ▁surv iving ▁episodes . ▁The ▁last ▁episode ▁of ▁Series ▁One , ▁" D ▁For ▁Dest ruction ", ▁thought ▁to ▁be ▁among ▁those ▁lost ▁forever , ▁was ▁recovered ▁in ▁ 2 0 0 3 , ▁from ▁a ▁mis label led ▁film ▁can ▁in ▁the ▁BBC ▁Archives . ▁It ▁has ▁been ▁shown ▁in ▁public ▁at ▁the ▁Miss ing ▁Bel ieved ▁W ip ed ▁event , ▁and ▁is ▁included ▁in ▁the ▁Complete ▁Collection ▁DVD ▁set . ▁ ▁Another ▁lost ▁episode , ▁" The ▁Bas ardi ▁Aff air ", ▁was ▁recovered ▁as ▁a ▁complete ▁audio ▁recording ▁in ▁ 2 0 1 7 . ▁ ▁A ▁public ▁appeal ▁campaign , ▁the ▁BBC ▁Archive ▁Tre asure ▁H unt , ▁continues ▁to ▁search ▁for ▁missing ▁episodes . ▁ ▁List ▁of ▁lost ▁episodes ▁ ▁* Exists ▁in ▁audio ▁form ▁ ▁In flu ences ▁and ▁legacy ▁ ▁The ▁Aven gers ▁With ▁its ▁pair ing