Gangrene

Gangrene is a Mutant from the Super Spychanger Lottery 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

Ask Vector Prime

According to a story Vector Prime heard in Axiom Nexus, after the Mutants of the G1 World 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