ated ▁portion ▁of ▁the ▁New ▁York ▁City ▁se wer ▁system ▁near ▁the ▁T urt les ▁and ▁S pl inter . ▁In ▁episodes ▁featuring ▁him , ▁the ▁Rat ▁King ▁would ▁often ▁en act ▁some ▁sort ▁of ▁plot ▁to ▁establish ▁his ▁own ▁rat - control led ▁government ▁and ▁bring ▁human ▁rule ▁to ▁an ▁end , ▁bel ieving ▁that ▁r ats ▁( which ▁he ▁counted ▁himself ▁as ) ▁were ▁superior ▁to ▁all ▁other ▁species , ▁whom ▁he ▁described ▁as ▁" in fer ior ▁non - rod ents ." ▁He ▁occasionally ▁joined ▁other ▁villa ins ▁in ▁group ▁efforts ▁that ▁would , ▁he ▁thought , ▁ultimately ▁help ▁his ▁own ▁goals . ▁In ▁some ▁episodes ▁of ▁the ▁show , ▁the ▁Rat ▁King ▁is ▁dep icted ▁as ▁somewhat ▁of ▁an ▁anti - h ero , ▁with ▁him , ▁on ▁one ▁occasion , ▁even ▁helping ▁the ▁T urt les ▁rescue ▁a ▁captured ▁April ▁O ' Ne il . ▁When ▁not ▁act ively ▁seeking ▁to ▁expand ▁his ▁" emp ire ", ▁the ▁Rat ▁King ▁eventually ▁seemed ▁content ▁to ▁simply ▁remain ▁under ground ▁with ▁his ▁loyal ▁r ats ▁and , ▁it ▁seems , ▁realized ▁it ▁was ▁more ▁to ▁his ▁advantage ▁to ▁have ▁the ▁T urt les ▁as ▁al lies ▁than ▁as ▁enemies . ▁His ▁final ▁appearance ▁is ▁in ▁early ▁season ▁ 8 , ▁with ▁new ▁att ire , ▁weapons , ▁and ▁mut ated ▁r ats ▁with ▁the ▁help ▁of ▁Sh red der ▁and ▁Kr ang , ▁however , ▁the ▁T urt les ▁manage ▁to ▁capture ▁him . ▁He ▁is ▁not ▁seen ▁or ▁mentioned