▁a ▁Hung arian ▁animation ▁studio . ▁Don ▁Bl uth ▁and ▁Gary ▁Gold man ▁were ▁so ▁diss atisf ied ▁with ▁the ▁changes ▁M GM ▁was ▁ins isting ▁that ▁they ▁left ▁during ▁production ▁( to ▁help ▁set ▁up ▁Fox ▁An imation ▁Studios ) ▁and ▁demanded ▁to ▁be ▁un cred ited ▁as ▁the ▁direct ors . ▁The ▁book ▁Anim ated ▁Films ▁said , ▁" changes ▁at ▁M GM ▁during ▁production ... result ed ▁in ▁the ▁project ▁being ▁affected ▁in ▁terms ▁of ▁production ▁value ". ▁In ▁a ▁ 2 0 0 1 ▁edition ▁of ▁his ▁magazine ▁To on ▁T alk , ▁Bl uth ▁admitted ▁" P engu in ▁had ▁story ▁problems . ▁We ▁knew ▁it . ▁The ▁crew ▁knew ▁it ". ▁Though ▁he ▁attempted ▁to ▁fix ▁these ▁issues ▁when ▁his ▁Irish ▁studio ▁got ▁taken ▁over ▁by ▁the ▁Hong ▁Kong ▁company ▁Media ▁As sets , ▁" the ▁story ▁and ▁film ▁were ▁now ▁comprom ised ", ▁so ▁neither ▁he ▁nor ▁Gold man ▁stayed . ▁They ▁had ▁their ▁names ▁removed ▁from ▁the ▁film ' s ▁cred its ▁and ▁accepted ▁an ▁offer ▁by ▁Bill ▁Mechan ic ▁- ▁ 2 0 th ▁Century ▁Fox ' s ▁then - pres ident ▁- ▁to ▁set ▁up ▁a ▁new ▁animation ▁studio ▁in ▁the ▁US ▁( which ▁would ▁become ▁Fox ▁An imation ▁Studios ). ▁Bl uth ▁said ▁to ▁his ▁animation ▁crew ▁" I ▁can ' t ▁che w ▁with ▁someone ▁else ' s ▁mouth ". ▁Despite ▁this ▁executive ▁inter ference , ▁The ▁Anim ated ▁Movie ▁Guide ▁noted ▁M GM / U A ▁producer ▁Walter ▁Mir isch