Unicron

Unicron is a multiversal singularity of Transformers Fiction.

"“Unicron is frightening. Unicron will destroy... will destroy space.”"

- —High Wire, "Uprising"

Unicron is the eternal arch-enemy of his twin brother Primus. He is known as the Dark God, the Chaos Bringer, the Planet Eater, and he is dedicated to consuming the multiverse. His goal is to bring an end to the annoying creation boasting independence around him, and find peace by becoming the living center of a swirling, infinite torrent of nothingness at the end of all things. He is a possible parody of the Fantastic Four villain Galactus, who is also a robotic planet consumer.

To undertake this seemingly overwhelming task, Unicron is able to travel across realities at will, a meandering plague upon existence itself.Integrated into his systems are incomprehensible quantum computers which calculate probabilities forward and backwards in time, in perpetuity, giving his processors an ever changing, evolving map of the multiverse.

The only thing that he fears is Primus' essence, contained inside the Matrix.

Frequently, Unicron will make deals with lesser beings, giving them vast new powers in exchange for their servitude. These minions are sometimes stripped entirely of their free will, but others follow him willingly. Service to Unicron, however, is a double edged sword, for it causes insanity and loss of self. And in the end, no matter their intent, Unicron's plans ultimately call for their consumption as well.

1986 Generation One Transformers movie
Unicron is the main villain of The Transformers: The Movie. He is known and feared by robotic Transformers (and all transformers other than he are tiny-sized compared to Unicron). He at the beginning of the film devours Cybertron's moon Lithone. Only one inhabitant of Lithone had survived (Marvelous). Then, he sent a mortally-wounded Megatron in a task to destroy the Matrix of Leadership and Ultra Magnus, the successor leader of Optimus Prime (who died in a battle with Megatron). Unicron turned Megatron into Galvatron. When Unicron proceeded on devouring Cybetron's moons, Galvatron was quickly furious at Unicron for this. When Galvatron wouldn't remain loyal, Unicron mind-controlled him as a slave to do whatever he orders him to do. Galvatron even tries to ally with the Autobots (his usual enemies) in order to save Cybertron from being destroyed by Unicron. Galvatron was unable to withstand Unicron's mind-controlling power, and he enslaved Galvatron into attacking Hot Rod, a young Autobot and the main character of the film. Hot Rod opened the Matrix of Leadership inside Unicron after throwing Galvatron out of Unicron's body, and Unicron was perished, with his head separated from his body.