Rewatching TMNT (2012) and recognized a voice. Turns out Victor Falco, aka The Rat King, a crazed scientist, is Jeffery Combs, voice actor for Ratchet in Transformers: Prime!! (as well as RiD
TMNT (2012) “I, Monster” (Spoilers) | Monsters of New York
Rat King (2012) — The Movie Database (TMDB)
Rat King Laughs GIF - Teenage Mutant Ninja Turtles Rat King Evil Laugh - Discover & Share GIFs
Rat King (2012) - IMDb
Dr victor falco the rat king rat king tmnt 2012 | Facebook
Rat King (Part 1) We Need Your Help - Teenage Mutant Ninja Turtles Legends - YouTube