layer ▁deg ener ated ▁into ▁an ▁even ▁more ▁mon str ous ▁form , ▁becoming ▁the ▁Rat ▁King . ▁ ▁The ▁Rat ▁King ▁makes ▁a ▁later ▁appearance ▁in ▁the ▁episode ▁" W ed ding ▁B ells ▁and ▁By tes ", ▁secret ly ▁watching ▁Case y ▁and ▁April ' s ▁wed ding ▁near ▁the ▁end ▁of ▁the ▁episode ▁with ▁a ▁smile . ▁ ▁Te en age ▁Mut ant ▁Nin ja ▁T urt les ▁( 2 0 1 2 – 2 0 1 7 ) ▁The ▁Rat ▁King ▁appeared ▁in ▁the ▁ 2 0 1 2 ▁Te en age ▁Mut ant ▁Nin ja ▁T urt les ▁cart oon , ▁vo iced ▁by ▁Jeff rey ▁Com bs . ▁In ▁this ▁series , ▁the ▁Rat ▁King ▁was ▁introduced ▁as ▁Victor ▁Fal co , ▁a ▁scient ist ▁working ▁on ▁a ▁ne uro chem ical ▁that ▁allows ▁him ▁to ▁read ▁thoughts , ▁and ▁ultimately , ▁to ▁anticip ate ▁every ▁move ▁the ▁T urt les ▁make . ▁He ▁first ▁appeared ▁in ▁" Mon key ▁Bra ins ," ▁where ▁the ▁T urt les ▁discovered ▁that ▁Fal co ▁had ▁been ▁experiment ing ▁on ▁his ▁partner , ▁Dr . ▁Ty ler ▁Rock well , ▁and ▁turned ▁him ▁into ▁a ▁hum ano id ▁mut ant ▁ch imp anze e ▁that ▁can ▁read ▁emot ions , ▁with ▁Don at ello ▁defe ating ▁him ▁in ▁a ▁fight ▁by ▁util izing ▁S pl inter ' s ▁earlier ▁less ons ▁about ▁how ▁to ▁avoid ▁thinking ▁in ▁a ▁fight . ▁In ▁" I , ▁Mon ster ," ▁Fal co ▁went