Fifi was the pet Stigorax of Helen A. She was fed on chocolate by Helen for some time. Helen decided she needed some sport and sent her through the underground pipes of Terra Alpha pursuing Ace. Ace set of an explosian injuring Fifi. Fifi was returned to Helen and her wounds were treated and bandaged. Helen then sent Fifi back down the pipes pursuing a number of kiljoys, the Doctor and Ace. She was killed when Earl Sigma caused an avalanche the crushed her. (DW: The Happiness Patrol)