▁theoretical ▁proposition . ▁However , ▁the ▁last ▁book ▁of ▁the ▁series , ▁Sk yl ark ▁Du Q ues ne , ▁was ▁written ▁in ▁ 1 9 6 3 , ▁when ▁the ▁United ▁States ▁and ▁the ▁Soviet ▁Union ▁were ▁involved ▁in ▁the ▁space ▁race . ▁Smith ▁adjust ed ▁the ▁past ▁of ▁his ▁series ▁accordingly , ▁mention ing ▁an ▁American ▁base ▁and ▁a ▁Soviet ▁one ▁being ▁established ▁on ▁the ▁Moon ▁prior ▁to ▁the ▁protagon ist ▁Se aton ▁discover ing ▁faster - than - light ▁flight . ▁ ▁Alan ▁Moore ' s ▁ret cons ▁often ▁involve ▁false ▁mem ories . ▁He ▁has ▁used ▁this ▁technique ▁in ▁the ▁Marvel man ▁series , ▁Sw amp ▁Th ing ▁and ▁Bat man : ▁The ▁K illing ▁Jo ke . ▁ ▁Ret con ning ▁can ▁bring ▁back ▁characters ▁who ▁were ▁initially ▁killed ▁off . ▁An ▁example ▁of ▁this ▁occurs ▁on ▁the ▁CBS ▁comedy ▁Two ▁and ▁a ▁Half ▁Men . ▁The ▁character ▁Charlie ▁Har per ▁( Char lie ▁She en ) ▁was ▁killed ▁in ▁a ▁train ▁accident ▁and ▁briefly ▁returns ▁as ▁a ▁g host ▁( play ed ▁by ▁Kath y ▁B ates ) ▁in ▁the ▁nin th ▁season . ▁Despite ▁numerous ▁instances ▁that ▁confirm ▁his ▁dem ise ▁including ▁the ▁fact ▁that ▁a ▁m util ated ▁body ▁was ▁in ▁his ▁coff in , ▁the ▁season ▁twelve ▁series ▁finale ▁" Of ▁Cour se ▁He ' s ▁Dead ", ▁it ▁is ▁revealed ▁that ▁Charlie ▁surv ived ▁the ▁or de al ▁and ▁has ▁been ▁held ▁capt ive ▁against ▁his ▁will ▁for ▁over ▁four ▁years . ▁It