The main Transformer army opposing the Autobots is the Decepticons. Generally characterized as miltaristic, brutal, and lacking in regard for personal freedom, they act as the Yin to the Autobots' Yang.
Millions of years ago, the Quintessons turned the planet Cybertron into a giant factory for producing robots. One line, the military hardware robots, became the Decepticons. Unsatisfied with the situation that arose following their ousting of the Quintessons from Cybertron, they began a series of attacks that escalated into the Cybertronian Civil War. At some point, the Decepticons found themselves in need of greater leadership and power, and created Megatron. Four million years ago, they were brought to Earth in the Ark, but the crash landing resulted in their deactivation. A volcanic eruption indirectly caused them to reawaken, at which point they left the Ark and set up a base of operations elsewhere.
Eventually, the Decepticons were able to communicate with Cybertron and set up an interdimensional link between the two planets known as the Spacebridge. Much of the Decepticon effort was put into collecting energon from Earth's resources and transporting them to Cybertron, where the Decepticons, led by Shockwave, had a stranglehold on the remaining Autobots. Despite this, the Autobots became a threat on Earth, and in 2005, Megatron ordered a full-scale attack on Autobot City. The Decepticons were eventually beaten back when reinforcements led by Optimus Prime turned the tide. Megatron, badly injured from the battle, could not prevent Starscream from ejecting him into space and thus overthrowing him. But before Starscream could be crowned, Megatron returned in the form of Galvatron and destroyed him. Though the Decepticons were supposed to help Unicron, they defended Cybertron en masse when he attacked it. They were badly outclassed, however, and relied on Rodimus Prime to defeat Unicron using the Autobot Matrix of Leadership. Presumably too weak and decimated to resist, the Decepticons allowed the Autobots to take Cybertron in the wake of the battle.
Although Rodimus declared this point to be the end of the Civil War, most historians believe he was being overconfident.
This is the just the beginning of the Decepticons History, to read more click to theTransformers On-Line Encyclopedia.
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Source of information: Transformers On-Line Encyclopedia.
