Unicron (CW)

"That which does not become part of the one, shall become one with the void."

Unicron is the Chaos Bringer -- a near-unstoppable force of nature. Consumption is the core of Unicron's being, providing the dominant characteristic of this dark, god-like entity. It devours everything in its path, from space trash to whole worlds, fully aware yet completely unrepentant about the dire consequences these actions have on living beings. Unicron exists above and beyond such petty moral concerns, seeking only to absorb all things in order to satiate its unquenchable and inexplicable desire for more power. This insatiable hunger has led the creature known as Unicron across not only whole galaxies, but also entire universes and dimensions as well. Since Unicron's thought processes, not to mention its immense size, put it on a plane of existence far beyond the average lifeform, it often employs agents to prepare the way for itself and deal with any mortal beings that could potentially stand in the way of its goals. These agents are usually super-powerful beings that Unicron has encountered and been somehow impressed by during its travels. Unicron itself was actually staggered and seemingly annihilated by the combined might of the Transformers, but many have become suspicious about whether this force of nature can ever truly be destroyed.

Canonical/Pre-MUX/Theme History:
The true origins of Unicron are unknown, but his existence is legend throughout the known universe.

Unicron's original physical body was constructed by the ancient genius known as Primacron at the dawn of the universe. Primacron had hoped that his creation would scour the galaxy clean of life, leaving a blank slate for him to experiment upon. However, Primacron's battle-station was possessed by the even-more-ancient god Unicron, and naturally, Unicron had no desire to be the servant of another. Unicron turned on Primacron, badly wounding him and his assistant, and setting out into the depths of space.

Cobra World
In 2005 Unicron destroyed Cybertron but, not finding what it was looking for, sent out its agents to scour the universe to find what it still seeks.