In ages long past, a cold and emotionless race of aliens called the Quintessons created two lines of sentient robots on a planet-sized factory known as Cybertron. One was a line of robots designed for domestic duties and labor (known as Autobots), and the other was a line designed for military use (known as Decepticons). The Quintessons were exceptionally cruel to their creations, eventually leading to wide-spread rebellion, a rebellion started by the Autobot A3. The Quintessons harshly suppressed the rebellion, setting back the rebels for millions of years.