Kryten 2X4B 532P, B.S. (Bachelor of Sanitation) is a Series 4000 mechanoid or 'slave 'noid'. He is very humanoid, with the exception of the flat cubic planes visible on his face and head. His brain is synthetic yet also partly organic, based on that of John Warburton. A neurotic mechanoid obsessed with cleaning and being a slave to humans, Kryten, with the help of Dave Lister, learns to break many of his programming protocols to become more independent and human like.