Cybertron is the Transformers' home planet. In most versions it is a world entirely covered in metal: instead of forests and oceans there are tower cities, bridges, underground tunnels and energy grids. Both Autobots and Decepticons come from Cybertron, and its destruction is why the war spilled over to Earth.
Planet or god?
The best-known modern idea is that Cybertron is the body of Primus himself, the creator god of the Transformers. His spark sleeps in the planet's core, and the Well of All Sparks, from which new Transformers are born, is tied to him. The 1984 cartoon didn't have this idea yet — it came from the Marvel comics and gradually became standard in most continuities.
Cities and regions
City names vary between versions, but a few recur from series to series: Iacon, the capital and Autobot stronghold; Kaon, an industrial city of mines and gladiatorial arenas where Megatron often comes from; and Vos, the city of flyers and Starscream's home in some stories. This geography explains the social conflict: the elite live in shining towers, the workers in the mines.
What happened to the planet
The long civil war drained Cybertron: Energon ran out, cities fell into ruin, and many versions show the planet almost dead. That is why, in cartoons and films alike, the heroes' main goal is often the same — to find a way to revive their home world or a new home for their people.
