Cerebros is simply a mindless drone who is the key to controlling Fortress Maximus. He is a Headmaster. In order for Fortress Maximus to reawaken, Cerebros must transform into the head of another robot known only by one name: The Emissary. The Emissary's only purpose is to transform into Fortress Maximus' head. Cerebros can only be awakened by an Autobot Leader: Optimus Prime. The only other Transformer who can awaken Cerebros is Scourge, since Megatron scanned Optimus Prime during his creation into a Decepticon. Japanese name: Plasma