Cybertron! It is the homeworld of the Transformers, once used by the Quintessons, (alien creators of the Transformers) as a factory planet with assembly lines creating soldier ("military hardware") and worker ("consumer goods") robots. Tensions arose, resulting in a rebellion that drove the Quintessons off of Cybertron. The workers became known as the Autobots and the soldiers became the Decepticons, both of which engaged in a civil war. Optimus Prime, and the villainous Megatron, along with their soldiers crash land on pre-historic Earth in two of their own respectve ships; the Ark and the Nemesis.