Unicron

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Unicron, the Chaos Bringer

The arch-enemy of his brother Primus, Unicron is dedicated to consuming the multiverse. The only thing that he fears is Primus' essence, contained inside the Matrix of Leadership.

In the beginning

At the birth of the Universe, an extradimensional entity known as The One created twin astral beings to reign over the cosmos.[1] One was Primus, the Lord of Light and Order. The other was Unicron, the Lord of Darkness and Chaos. Unicron sought to devour everything that exists and become one with The Void at the end of all things.

Primus was no match for Unicron. But Primus did manage to trap both his and Unicron's essences inside metallic planetoids. Over time, Unicron learned to shape his planetoid into a metal being that was able to transform between planet mode and a robot mode which resembled his original astral form. The two brothers shared a mental link. So long as Primus hid himself in slumber, so did Unicron also sleep. Their war ended, for a time, in stalemate.

The War of the Balance

Primus' Primal Scream

Grimlock, Jazz, and Bumblebee found themselves transported to the center of Cybertron. In a battle with Bludgeon's Pretenders, a laser blast ricocheted off Grimlock and struck the essence of the sleeping Primus, causing a multiverse-shaking Primal Scream that woke Unicron and alerted him to Primus' location.

The battle between Primus and Unicron began anew. Though Unicron would sometimes be defeated, this is always temporary, and there is a whole multiverse of realities to consume. When Unicron is destroyed in one reality, he will respawn in another, ready to eat again.

Marvel Comics

After the Primal Scream, Unicron headed directly towards Cybertron. He created three Heralds to send ahead of him and prepare the Transformers for his arrival: Hook, Line, and Sinker. He also borrowed a version of Galvatron from another dimension's future in which he was successful in devouring Cybertron.

(Interestingly, Unicron does not seem to possess his "brother's" ability to create life, instead being capable merely of modifying existing lifeforms to meet his demands.)

He also awoke a sleeper cell of Transformers, a brainwashed cult that attacked the two united factions which had newly gathered on Cybertron to face Unicron. These cultists were defeated just as Unicron arrived.

Unicron was so unimaginably big that the mere sight of him froze both Transformer factions into inaction. Unicron was disappointed that it was this easy. He tore apart the planet's surface. It was only the actions of the kidnapped Galvatron which snapped the Transformers out of the terror. But even the united Transformers were unable to hold him off. After being fazed by the Neo-Knight Rapture and temporarily shorted out by Circuit Breaker, it was Optimus Prime who flew towards Unicron and opened the Matrix. The life contained inside caused Unicron to explode.

Unicron showed up a few more times in this universe. He showed up again in 2005 in events similar to his appearance in Transformers: The Movie. In 2007, he used mind control to force Junkions to build him a new body out of the planet of Junk. And in the far, far, future, his essence began to corrupt the Matrix itself, turning Rodimus Prime evil and forcing him into exile.

Transformers: The Movie

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Unicron in planet mode

In his first documented appearance, Unicron was known as a giant Transformer which devoured everything in his path. After the Battle of Autobot City, Megatron and several dead Decepticons were dumped in space. Unicron reformatted Megatron into Galvatron and out of the dead Decepticons, he created Cyclonus, Scourge, and Scourge's Sweeps. He ordered them to destroy the Matrix.

Galvatron returned with the Matrix, but intended to use it to make Unicron his slave. Unicron ate him. After eating two of Cybertron's moons, Unicron attacked Cybertron. Shockwave and the rest of the Decepticons, at the time in control of Cybertron, fought back, but this had little effect. Unicron swallowed many spaceships, one of which contained the young Autobot Hot Rod. Hot Rod and Galvatron battled deep inside Unicron. Ultimately, Hot Rod was able to retake the Matrix, change into Rodimus Prime, defeat Galvatron, and use the Matrix to destroy Unicron. Unicron's body exploded, though its head remained intact and orbited Cybertron.

Transformers Universe

After being defeated by the Wreckers, Unicron floated in ruin. Using what energies he had left, he called Transformers from various corners of the multiverse inside him to do battle. He feasted upon the sparks of the losers, growing ever more powerful. Primus countered this by calling his own army from the multiverse, led by Optimus Primal. Primal was able to set free the captives inside Unicron and begin a new war between the Minions of Unicron and the Children of Primus.

Transformers Cybertron

Primus' plan to trap Unicron in the heart of a new sun failed, and instead resulted in a black hole that threatened the multiverse. His heralds Ramjet and Nemesis Prime travelled to Cybertron to unleash the Dead Matrix upon Primus' vulnerable essence.

The fate of Unicron is still to be determined.

From Teletraan I: The Transformers Wiki, a Wikia wiki.