4 million years later, contact with the Earth-stranded Transformers was re-established. Megatron used the space bridge to pull Cybertron into the Sol system again, causing mass destruction on Earth due to the gravitational pull. The Autobots were eventually able to move Cybertron away, but it was now in or near the Sol system permanently. Decepticons proceeded to ship energon to Cybertron from Earth, while the Autobots tried to give what help they could to each other. In one incident, it was revealed that at the center of Cybertron laid Vector Sigma, the only device known at the time to create Transformer life. However, while the Decepticons were gaining little ground on Earth, it soon became clear that the Autobot resistance on Cybertron was outmatched, and the members relocated to secret staging grounds on Cybertron's moons.
In 2005, Unicron arrived and ate two of Cybertron's moons. Although he then attempted to ingest Cybertron as well, he was destroyed by the Autobot Matrix of Leadership before he could do so. The Decepticons were driven off the planet following the massacre, and the Autobots claimed itt for themselves. Soon afterwards, it was revealed that Cybertron's underground caverns contained a device capable of freezing up every Transformer in the universe. It was used by the Quintessons briefly before being destroyed by Spike Witwicky.
In the time since, it has appeared that the Decepticons have once again gained a foothold on Cybertron, although it is clear that now, they are the minority.
Cybertronian Law: Megatron indicated to Optimus Prime that Cybertronian Law allowed for gladitorial combat between two champions to decide the fate of their respective armies. The army of the non-victorious party was to be banished. Although this law remained vague, it apparently requires the combatants to fight unenhanced.
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Article written with contributions by Lia Brown. Additions by Nick Peron
The Cybertronian Civil Wars broke the line that Primus created, and caused the planet Cybertron to fling out of its orbit around Alpha Centauri. In the years that followed, Cybertron passed through the Sol system and deposited a number of Autobots and Decepticons onto the planet Earth. 4 million years later, the Decepticons on Earth established contact with Cybertron. The Autobots did so as well, but only years after their enemies did. The Decepticons also managed to link the two planets via an interdimensional spacebridge, which allowed physical travel between the two worlds. Eventually, both parties would come to invent alternatives to spacebridge travel.
During a battle between Decepticon Pretenders and several Autobots, a stray shot from Octopunch (which bounced off of Grimlock's armor) hit Primus deep inside Cybertron, causing him to scream. Unicron heard this and immediately headed for Cybertron. A Galvatron from an alternate future was sent to Cybertron by Unicron to destroy the Matrix, but he rebelled and instead convinced Unicron to recall all the Transformers back to Cybertron. Primus agreed and possessed the body of Emirate Xaaron. During the battle with Unicron, Primus (in the body of Xaaron) was destroyed, and his lifeforce (from the Matrix) emptied inside of Unicron. This caused the planet to initiate a series of tremors that convinced the survivors that the planet was self-destructing. In truth, it was merely undergoing growing pains which needed the help of the Last Autobot to remedy. He did so, and the Autobots took control of Cybertron.
Cybertronian Law: At one point, Grimlock mentioned a trial of grievance to Fortress Maximus, who noted with distaste its anachronism, but admitted to its validity. In short, when two Autobots disagreed on something, a duel between the two (or their champions) settled the matter. Weapons were allowed.
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