The term "UFO Robot" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if they exist.
UFO Robots were minions of the Mothership. They resembled flying saucers with robotic legs and followed Giant Clank, attempting to electrocute him. The Mothership deployed four of these at a time.