Cataclysmic Variabot, later shortened to C.V., was a robot from Milton Keynes, that fought in both series of Robot Wars Extreme. Having fought and lost in a Mayhem in its first appearance, it represented the Open University in Extreme Series 2 by taking part in the University Challenge, ultimately losing to Tiberius 3 in the second round. Its name was likely a pun on "Cataclysmic Variable", a type of Star, possibly being studied by the team members who were taking Astronomy degrees with the Open University.