▁like ▁in ▁the ▁com ics , ▁the ▁Rat ▁King ▁surv ives ▁the ▁fall ▁into ▁the ▁sil o ▁after ▁his ▁fight ▁with ▁Leon ardo . ▁ ▁Through out ▁" I , ▁Mon ster ", ▁various ▁flash back s ▁reve al ▁the ▁origin ▁of ▁this ▁series ' ▁version ▁of ▁the ▁Rat ▁King ; ▁the ▁episode ▁reve als ▁the ▁Rat ▁King ▁was ▁originally ▁the ▁S layer , ▁from ▁the ▁episode ▁" B ishop ' s ▁G amb it ", ▁a ▁prototype ▁bio - me chan ical ▁cy borg ▁super ▁soldier ▁created ▁by ▁Agent ▁Bishop ▁using ▁gen et ically ▁manip ulated , ▁al ien , ▁the ▁t urt les , ▁his ▁own ▁and ▁S pl inter ' s ▁DNA . ▁The ▁S layer ▁was ▁meant ▁to ▁be ▁used ▁to ▁fight ▁off ▁any ▁al ien ▁thre ats ▁and ▁was ▁given ▁a ▁test ▁run ▁against ▁the ▁T urt les , ▁who ▁broke ▁into ▁Bishop ' s ▁labor atory ▁looking ▁for ▁the ▁kid n apped ▁S pl inter . ▁The ▁S layer ▁was ▁pres umed ▁destroyed ▁when ▁a ▁fight ▁between ▁him , ▁the ▁T urt les , ▁S pl inter ▁and ▁Bishop ▁flo oded ▁the ▁agent ' s ▁lab . ▁In ▁actual ity , ▁the ▁S layer ▁surv ived ▁and ▁was ▁sent ▁hur d ling ▁through ▁the ▁se wers , ▁eventually ▁being ▁depos ited ▁near ▁the ▁industrial ▁park ▁the ▁events ▁of ▁" I , ▁Mon ster " ▁take ▁place ▁in . ▁Los ing ▁several ▁of ▁his ▁robot ic ▁parts , ▁clo aking ▁device ▁and ▁he aling ▁ability , ▁the ▁S