Sorry, but you are incorrect. The original comic the mutagen just mutates animals/creatures into humanoid form. The 1987 cartoon changed that NP Nurse Practitioner EST 2019 – T-shirt, by having the mutagen do different things to different species – most notably where it’ll mutate you into something you were closest to last (Splinter was near a rat last, and same thing with Bebop & Rocksteady).
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Thank you so much everyone for mentioning the original Mirage comic, it is true Splinter was a rat originally that mutated into a bigger rat with more intelligence and learning Ninjutsu from mimicking Hamato Yoshi’s moves. Without the original comics and brains and creativity from Kevin Eastman and Peter Laird we wouldn’t have Ninja Turtles today including that original 80’s cartoon that many like myself grew up with NP Nurse Practitioner EST 2019 – T-shirt. I glad to be part of a fan base like this because I find it very cool and constructive. Still love turtles today and have been a fan since the golden age of it.