Cybertron is the Transformers' prized home world. It was once a peaceful planet, until a gladiator named Megatronus decided to bring war to it by upsetting the cast system. Now, it is ravaged by battles between the Autobots and the Decepticons.
War For Cybertron[]
In War For Cybertron, Megatron and his Decepticons found a new source of power, Dark Energon. After taking down Omega Supreme, the key to Cybertron's core, Megatron corrupted the entire planet with the vile energon. Then, the newly appointed Prime, Optimus Prime, Ironhide, and Warpath traveled to Cybertron's core to free it from the corrupted Dark Energon. Despite being freed of it, Cybertron must shut down for millions of years.