Mutagen (2012 TV series)

Mutagen, also known as Retromutagen Ooze, is a mucilaginous substance that has served as a key plot device in nearly every medium of the Teenage Mutant Ninja Turtles. Any creature that is exposed to mutagen will rapidly increase in size, strength and intelligence (sometimes), and even gain superpowers. It is responsible for mutating, among others, Splinter, the four turtles, and villains such as Dogpound & Fishface.

In this series, the Mutagen is depicted as having several similar properties to the version seen in the 1987 series; It blends with the victim's genetics with that of whatever creature they have last made contact with. It has a glowingly blue/green coloration to it. Michelangelo occasionally refers to it as 'mom' in this cartoon, due to the role that it played in their creation, while Hamato Yoshi's human DNA was ultimately responsible for the humanoid form that they took on. The Mutagen also seems to have the ability to merge organic substances and inorganic substances, as seen with Spy-Roach, and the same subject shows that it can also cause similar effects to the original comic version, both increasing size and intelligence (sometimes). However, Parasitica shows that this isn't always the case...

As seen in "The Pulverizer Returns!", if a human has not come into contact with an animal or plant before being effected by Mutagen, their bodies will be molecularly broken down, turning them into a pile of acidic goop, with only their internal organs still remaining and intact...Pulverizer also states that the Mutagen burns a lot.

It has been stated that the Mutagen was not intentionally created as a mutative agent; It apparently had a different property or two when it was created in the Kraang's home dimension, but the new laws of physics in this plane of existence (our dimension) altered it's function. It was shown in The Manhattan Project that the Mutagen is a natural by-product of massive, worm-like creatures known as Kraathatrogons.

Anti-mutagen
Donnie is trying to create an antidote, this time called retromutagen, to cure those who came in contact with the mutagen, specially Timothy and Kirby O'Neil.