Megatron is the leader of the evil Decepticons. In War For Cybertron, Megatron corrupted the very core of Cybertron with vile Dark Energon, so he would have an infinite supply of it. In Exodus, a young Megatron and Optronix were once allies, when Megatron still was starting a revolution to change Cybertron for the better. In Fall of Cybertron, Megatron seems to have changed his design so that in robot mode, his chest looks like the face of the fallen Trypticon, who used to be the Cons' orbital space station.