Unicron is a character from the Transformers universe and toyline. Created by Floro Dery, he was introduced in the 1986 animated film The Transformers: The Movie as the film's main antagonist. Neither Autobot nor Decepticon, Unicron is a prodigiously large robot whose scale reaches planetary proportions, and he is also able to transform into a mechanical planet.
The character Unicron first appeared in the opening scene of 1986's The Transformers: The Movie, immediately making clear his driving goal by consuming the small world of Lithone in the year 2005. Subsequently, when the battered bodies of Decepticon leader Megatron and several of his troops were set adrift in space by Starscream following a furious battle with the Autobot, Unicron appeared before them and offered Megatron a deal: in exchange for a new body, and new troops, Megatron would destroy the Autobot Matrix of Leadership, the only thing that could stand in Unicron's way. Thus, Megatron became Galvatron, and began to carry out his assigned task, although he was loath to do so. When Galvatron showed any signs of opposition to Unicron's will, Unicron inflicted agonizing torture on his servant, even from a great distance, to coerce him into obedience. Following Unicron's consumption of Cybertron's two moons, Galvatron successfully obtained the Matrix, believing he could use it to bring Unicron under his control. Attempting to open the Matrix to intimidate Unicron, Galvatron only prompted his transformation into robot mode, and was swallowed by the planet-eater. Unicron proceeded to lay waste to Cybertron, halted briefly when the young Autobot, Hot Rod, crashed a Quintesson spacecraft through his eye. Finding Hot Rod inside Unicron's body, Galvatron suggested an alliance against their common enemy. However, Unicron inflicted his mental torture upon Galvatron, forcing him to fight Hot Rod. Hot Rod took the Matrix from Galvatron during the battle, and became Rodimus Prime. Rodimus threw Galvatron into space, freeing the Decepticon from Unicron's mind-control, and opened the Matrix within Unicron, destroying his body, leaving only his head, which became a moon of Cybertron.
Controversy surrounded the revelation of Unicron's cartoon origin, with many fans taking a dim view of his origin as the creation of a primate. The wildly different origin for Unicron presented in Marvel Comics proved to be overwhelmingly more popular, and has shaped Unicron in fiction twenty years hence.
Far more than a mere product of science, as in the cartoon, Unicron was a fallen god from before the universe existed, who sought the ultimate peace that would be granted by the destruction of all life. Amazingly, Unicron accomplished this task, wiping out all life, planets, stars and nebulae, even "the stuff of space itself" in the universe and leaving only nothingness and void. His lust for destruction finally sated, Unicron entered a deep sleep - but he had not been thorough enough. Tiny fragments of the old universe reacted with each other, and a new universe was born. As Unicron slept, the core of this new universe - somehow a sentient being - became aware of Unicron's threat and created a defender to battle his evil - Primus, the lord of light. Unicron awoke to find himself surrounded by another universe, and simply began to destroy it again.
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Official Site: Hasbro
Links: Wikipedia Ben's World of Transformers Temple of Unicron