, ▁and ▁one ▁of ▁the ▁ant agon ists , ▁MB , ▁is ▁an ▁android ▁housing ▁an ▁A I ▁based ▁on ▁Mother ▁Bra in . ▁ ▁R id ley ▁▁ ▁is ▁the ▁ar chen emy ▁of ▁Sam us ▁A ran , ▁an ▁intellig ent ▁and ▁sad istic ▁drag on - like ▁extr ater rest rial ▁that ▁despite ▁being ▁killed ▁multiple ▁times ▁by ▁her , ▁is ▁always ▁rev ived ▁by ▁the ▁Space ▁Pir ates ▁( or ▁accident ally ▁by ▁the ▁Gal actic ▁Federation ▁in ▁Met roid : ▁Other ▁M ) ▁using ▁cl oning ▁or ▁robot ics . ▁Other ▁than ▁Sam us ▁and ▁the ▁tit ular ▁Met roid s , ▁R id ley ▁is ▁the ▁only ▁character ▁that ▁has ▁appeared ▁consist ently ▁throughout ▁most ▁of ▁the ▁games ▁in ▁the ▁series ▁( the ▁exceptions ▁being ▁Met roid ▁II : ▁Return ▁of ▁Sam us ▁for ▁the ▁Game ▁Boy , ▁Met roid ▁Prime ▁ 2 : ▁E cho es ▁for ▁the ▁Game C ube , ▁Met roid ▁Prime ▁Hun ters ▁for ▁the ▁N intendo ▁D S , ▁and ▁Met roid ▁Prime : ▁Federation ▁Force ▁for ▁the ▁N intendo ▁ 3 DS ). ▁He ▁is ▁directly ▁responsible ▁for ▁the ▁invasion ▁of ▁Sam us ' ▁home ▁planet , ▁and ▁the ▁death ▁of ▁her ▁parents , ▁and ▁is ▁the ▁franch ise ' s ▁primary ▁villa in , ▁despite ▁not ▁typically ▁acting ▁as ▁the ▁main ▁ant agon ist ▁in ▁an ▁individual ▁game . ▁ ▁K raid ▁ ▁is ▁a ▁gig antic ▁din osa ur - like ▁be ast ▁and ▁a ▁member ▁of ▁the