s ▁stories ▁he ▁wrote ▁for ▁DC ▁Comics , ▁including ▁Bat man : ▁Dark ▁Al leg ian ces ▁which ▁he ▁wrote ▁and ▁drew ▁in ▁ 1 9 9 6 , ▁his ▁com ic ▁output ▁became ▁minimal ▁as ▁he ▁became ▁more ▁involved ▁in ▁film ▁and ▁television ▁work . ▁He ▁was ▁executive ▁script ▁consult ant ▁for ▁the ▁ 1 9 9 0 – 1 9 9 1 ▁The ▁Flash ▁television ▁series ▁on ▁CBS , ▁and ▁later ▁worked ▁on ▁action - ad vent ure ▁programs ▁such ▁as ▁Vi per , ▁Earth : ▁Final ▁Conf lict ▁and ▁Mut ant ▁X . ▁ ▁Near ▁the ▁end ▁of ▁the ▁de cade , ▁Ch ay kin ▁returned ▁to ▁com ics ▁and ▁co - w rote ▁with ▁David ▁T isch man ▁the ▁three - issue ▁min is eries ▁P ulp ▁Fant astic ▁for ▁the ▁Vert igo ▁im print ▁of ▁DC , ▁with ▁art ▁by ▁Rick ▁B urch ett . ▁▁ 2 0 0 0 s ▁Ch ay kin ▁began ▁co - writing ▁American ▁Century ▁with ▁David ▁T isch mann ▁for ▁Vert igo . ▁This ▁story , ▁set ▁in ▁post - war ▁America , ▁would ▁be ▁a ▁pul p - ad vent ure ▁strip ▁inspired ▁by ▁the ▁lik es ▁of ▁Terry ▁and ▁the ▁Pir ates ▁as ▁well ▁as ▁the ▁EC ▁Comics ▁war ▁stories ▁created ▁by ▁Har vey ▁Kurt z man . ▁That ▁year , ▁Ch ay kin ▁became ▁part ▁of ▁the ▁cre ative ▁team ▁on ▁Mut ant ▁X , ▁a ▁television ▁series ▁inspired ▁by ▁the ▁Marvel ▁Comics ▁series ▁of ▁mut ant ▁titles .