Bio: The Moderator was a mercenary employed to steal the Doctor's TARDIS for Josiah W. Dogbolter. In his failed attempt, he killed the Doctor's companion Gus, and died at the digits of Hob, Dogbolter's robot valet. He was generally assumed to be a robot, but when Gus critically injured him, his inner humanoid was revealed as his helmet fell off. His species is unknown.
Notes: For fans of video games, this character may be safely thought of as a version of Metroid.