In the Marvel Comics "Transformers" comics, Unicron is a fallen god from before the universe existed who seeks the ultimate peace granted by the destruction of all life. Unicron accomplishes this, wiping out everything in the universe and leaving only nothingness and void. His lust for destruction sated, Unicron enters a deep sleep, but he had not been thorough enough. Tiny fragments of the old universe react with each other, and a new universe is born. As Unicron sleeps, the core of this new universe - somehow a sentient being - becomes aware of Unicron's threat and creates a defender to battle his evil - Primus, the lord of light. Unicron awakes to find himself surrounded by another universe, and begins to destroy it again.