Refers to three villainous factions in Transformers:

1. A subgroup of monstrous Decepticons from Generation 1 that combine into the savage (yet extremely unintelligent) Abominus.

2. Zombified Cybertronians reanimated by Dark Energon from Transformers Prime.

3. A group of brutal warriors that serve Unicron in Transformers: Rise of the Beasts. Led by Scourge, they subjugate entire planets for their dark master to feast upon.