▁since ▁“ V in cent ▁and ▁the ▁Doctor ” ▁tack led ▁de pression ▁back ▁in ▁ 2 0 1 0 ". ▁He ▁also ▁pra ised ▁Har ness ' ▁script , ▁saying ▁he ▁did ▁" a ▁great ▁job " ▁with ▁the ▁character ▁of ▁Os good , ▁and ▁pra ised ▁the ▁Z yg ons ▁as ▁" f rank ly ▁pretty ▁ter r ifying ". ▁He ▁also ▁pra ised ▁Clara ' s ▁plot ▁tw ist , ▁by ▁stating ▁" The ▁episode ’ s ▁greatest ▁triumph ▁in ▁this ▁area ▁is ▁what ▁was ▁done ▁with ▁Clara , ▁which ▁is ▁shock ing ▁on ▁the ▁first ▁view ing ▁and ▁master ful ▁on ▁a ▁second ". ▁Scott ▁Coll ura ▁of ▁I GN ▁also ▁pra ised ▁the ▁episode , ▁award ing ▁it ▁a ▁score ▁of ▁ 7 . 8 , ▁de emed ▁as ▁a ▁" Good " ▁score . ▁He ▁particularly ▁pra ised ▁the ▁character ▁of ▁Os good ▁in ▁the ▁episode ▁and ▁the ▁" ref uge e ▁sub text ", ▁while ▁stating ▁that ▁it ▁" poses ▁some ▁thought - prov oking ▁questions ". ▁ ▁Ka ite ▁Wel sh ▁of ▁Ind ie W ire ▁highly ▁acc laimed ▁the ▁episode , ▁award ing ▁it ▁a ▁grade ▁of ▁A ++, ▁the ▁highest ▁grade ▁possible . ▁Call ing ▁the ▁episode ▁a ▁" class ic ", ▁she ▁further ▁said ▁that ▁it ▁" more ▁than ▁lives ▁up ▁to ▁the ▁h ype , ▁with ▁some ▁stell ar ▁political ▁comment ary , ▁brilliant ▁performances ▁and ▁some ▁very ▁cre ep y ▁child ▁actors ". ▁She ▁further ▁pra ised ▁the ▁episode '