Unicron

Unicron is the devil of Transformers. Known as The Chaos Bringer, Unicron is the opposite to his brother Primus. Fueled by evil, Unicron is the embodiment of evil. If he were to be destroyed, the results would be catastrophic. He is know to devour whole worlds and control a considerable amount of power. So much, that when he and Primus fought at the beginning of time, their battle would've caused the universe to collapse.