Gangrene

Gangrene is a mutant Cybertronian from the Car Robots portion of the Generation 1 continuity family.

You can't see me!

_{This character has no official visual representation in any Transformers product or media... yet, at least.}

Gangrene is a Mutant under the command of Chainsaw.

Fiction

Japanese Generation 1 cartoon continuity

After the Mutants took control of the Global Space Bridge on Earth, Gangrene attempted to disrupt the 2002 World Cup with shamanic magic. He was stopped by Super X-Car and his new gravity manipulation powers. Ask Vector Prime, 2015/08/01