Autobot, a faction of sentient robots from the planet Cybertron, are usually the main protagonist in the fictional universe of the Transformers, a collection of various toys, graphic novels, paperback books, cartoons and movies first introduced in 1984. In all but one Transformer story, the "Heroic Autobots" are opposed by the "Evil Decepticon"—the main antagonist in Transformers. Both Autobots and Decepticons are humanoid robot that can transform into machines, vehicles and other familiar mechanical objects. Autobots often turn into civilian vehicles but some are aircraft, military vehicles, communication devices, weapons, and cyborg animals. While the Autobots have usually found themselves outnumbered by the Decepticons (early in generation 1 they outnumbered the Decepticons 2 to 1), the Autobots have always had home-field advantage, having not only the human's military support, but also having more places on Earth to fall back on, while the Decepticons are entirely unwelcome on Earth.
In all Transformers stories, the Autobots and their adversaries, the Decepticon, originated on the planet Cybertron. The planet is almost always depicted as a purely metallic body. The capital of Cybertron is Iacon. In later issues of the Marvel comic line, Cybertron is shown to have weather, such as rain.
Both Autobots and Decepticons were created by Primus. In most continuities this is still the case. Though Marvel's original series gave no purpose other than benevolent self-image creation for Transformers, some continuities add/modify that the Transformers were created to defend the universe.
In the original U.S. cartoon line, Autobots were the descendants of a line of robots created as consumer goods by the Quintessons on the planet Cybertron. Their bodies were forged by the Plasma Energy Chamber and given intelligence by the mega-computer Vector Sigma in order for the work to be carried out. Eventually, they developed sentience and rebelled against their creators. However, A-3, the resistance leader was displaced from time by Quintessons from the future in order to stop the insurgency. The resistance had help from future Autobots (whose transformation technology frightened them) and A-3 returned to turn the tide by activating his coda-remote which deactivated the Quintessons' Dark Guardian Robots.
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