Cybertron
Cybertron is the home world of the Autobots and Decepticons in the assorted stories in the fictional Transformers universes. The capital of Cybertron is the Iacon Hub City and serves as the base of operations for the Autobots. Other cities are Kaon (the Decepticon capital), Perihex, Antihex, Uraya, Polyhex, Vos, Tarn, Nova Cronum, and Crystal City (destroyed). By the time of Beast Wars, a city known as Cybertropolis supplanted Iacon as the planet's capital city. The Armada comics introduced a city known as "Cyber City", and the Energon cartoon had a city called "Central City". In the IDW comics, it has been rendered uninhabitable by the war. There were also other series-specific locations, such as the Crystal City in the original animated cartoon series, and the Dead End (a wasteland of ruins inhabited by the disabled, deranged and derelicts of Cybertron) in the Marvel Comics. In the Japanese series, the planet is also referred to as "Cybertron" (first shown on Japanese Galaxy Force packaging) but pronounced as Seibertron.
The Transformers (TV series)
In the TV series, Cybertron is a small planet once used by the Quintessons as a factory to create assembly lines of soldier ("military hardware") and worker ("consumer goods") robots. Following a rebellion, the workers became the Autobots and the soldiers became the Decepticons. During Optimus Prime and Megatron's four million year absence, Shockwave keeps the planet in stalemate until Megatron awakes in 1984, and he conquers the planet by 2005.
Cybertron is seen to have at least three moons, two of which are consumed by Unicron in 2005. Unicron's head became an artificial satellite when his body was destroyed during his attack on Cybertron.
The Transformers (Marvel comic)
Cybertron is the material body of Primus, who was the good counterpart to Unicron. Primus enabled the Transformers to reproduce via 'budding' - a process similar to cell division - but, when it spawned a dark energy called The Swarm, Primus wiped their memories of it. During Optimus Prime and Megatron's four million year absence, a guerrilla war was fought between Emirate Xaaron and Lord Straxus until the leaders returned in 1984. Interference from Shockwave, Starscream, Galvatron and Bludgeon kept the war going until the Autobots and Decepticons temporarily united in order to defend the planet from Unicron, and later joined forces in order to begin a new war against Jhiaxus.
Beast Wars Era
Using the TV series and Marvel comics as a backstory, Cybertron is a peaceful planet, formerly made of organic matter before Primus made it his vessel, inhabited by the Maximals and Predacons. The Tripredacus Council bides its time waiting for war, but a new Megatron is impatient and travels back in time to change history. Failing, he returns with a new virus giving him control of Sparks, before Optimus Primal overthrows his rule, turning the planet into a techno-organic one.
Dreamwave
As in the Marvel comics, Cybertron is the material body of Primus. The scars of battle with Unicron at the dawn of the universe also influence the Decepticons. During Optimus Prime and Megatron's absence, Shockwave kept the planet in stasis, and sabotaged their attempt in the 1990s to get back to Cybertron.
Unicron Trilogy (Armada, Energon and Cybertron)
Cybertron, Primus' material body, is inhabited by Mini-Cons as well as Autobots and Decepticons, who are unaware the Mini-Cons were weapons forged by Unicron. The war between the Autobots and Decepticons is escalated by Megatron's attempt to gather them. Sometime during the escalation, the Mini-Cons liberate themselves and leave the planet in a mass exodus, leading to a four million years (one million years in the Dreamwave comic) stalemate between the two principal forces. Ten years of peace follow Armada (2002-04) and then Energon (2014). After Cybertron's climax, the planet has an atmosphere more suitable for humans and organic wildlife.
Transformers (2007 live action film)
Cybertron is not shown as a metallic sphere, but a mountainous husk of a planet that has been ravaged by war. According to Transformers: The Movie Prequel comic book by IDW Publishing, Optimus Prime and Megatron co-ruled Cybertron. The Allspark is responsible for giving life to the Transformers. When Megatron begins a war to control it for himself, Optimus sends it into the depths of outer space in the hope that he can defeat him quickly. The war drags on, and Optimus sends Bumblebee to retrieve it, because its absence will cause the planet to shut down. In the film, the Allspark is destroyed, so Cybertron cannot be restored. Optimus declares Earth the new home of the Autobots.
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