personality, and has a particularly conflictual relationship with Lister. During Series 7, Rimmer leaves the dimension shared by his crewmates to become his swashbuckling dimensional counterpart, Ace Rimmer. However, pre-hologram Rimmer, along with the rest of the original crew, is resurrected by nanobots at the start of Series 8; after coming face to face with Death at the end of the series, whom he kicks in the groin, he is once again a hologram from series 9 onwards, although the circumstances that led to this are never fully explained. Danny John-Jules as the Cat:A humanoid creature with cat-like teeth who evolved from the offspring of Lister's smuggled pet cat Frankenstein. The Cat or simply "Cat" (who is never given an actual name) is self-centered and concerned with little other than sleeping, eating, and fawning over his appearance, and tends not to socialise with other members of the crew in early episodes. Over time, he grows closer to his crewmates and becomes a useful part of the crew. Unlike his human companions, he has a "cool" sounding pulse, six nipples, and colour-coordinated internal organs. Norman Lovett (regular series 1-2, 8, The Promised Land; guest series 7, 12) and Hattie Hayridge (guest series 2; regular series 3-5) as Holly:The ship's computer who appears on screens as a floating head and originally has a functional IQ of 6000 but as a result of remaining alone without any maintenance during the three million years Lister is in stasis develops "computer senility". Although Holly is male during the first two series, they become female between series 2 and 3, taking the voice and appearance of Hilly, an alternative version of themselves encountered in the series 2 finale and with whom they had fallen in love. Following an unexplained absence in series 6, male Holly returns in the series 7 finale. Between series 8 and 9, Lister's bath overflows, and the water gets into Holly's circuitry, causing them to malfunction and go offline. In The Promised Land, the discovery of a backup drive allows the return of male Holly, originally with their memory and IQ rebooted, but eventually back to their usual dysfunctional self. David Ross (guest series 2) and Robert Llewellyn (regular series 3-present) as Kryten 2X4B-523P:A sanitation android rescued by the crew from the crashed spaceship Nova 5 in the first episode of series 2, after having spent countless years continuing to serve the