I believe that some things are fated and that, despite Doug Naylor primarily wanting the return of Kryten and for David Ross to play him again, Rob Grant was entirely correct to question the wisdom of this. For me, Ross's Kryten was beautifully old fashioned English, as if playing an institutionalised butler to the very upper class. His performance was so moving, such as when he tells Lister of his dream to get a garden - not somewhere like Fiji like Lister's grand scheme - just anywhere - that he could have never lived up to the melancholy of that episode again without Red Dwarf being turned in to a drama. He could clearly do comedy too but it was in contrast to the smegginess of the rest of the crew rather than in a harmony with them. He'd stamped Kryten with such beautifully complex sincerity that he would have taken over the whole show and would have made Lister seem too noble for comedy's sake in being a true friend to him. Basically, you'd never want to see his Kryten reduced to cleaning Lister's gussets nor hosting Krytie TV - it would seem too tragic a fall. For longevity, a different, non-English, less classbound, Kryten was needed and, for that, hello Robert Llewellyn. Perhaps Ross himself, brilliant actor as he was in the episode, realised this and the play that he was about to do was a convenient reason why he'd never do it again. It just goes to show that he put in such an iconic performance ("But I was only gone two minutes". "I think I'm rebelling.."] that they could have mistaken a perfect, movie-like, performance for something that could or should be repeated each week. But Ross was extraordinarily good at pathos in that episode and doesn't belong in this list, in the slightest. He also voiced Talkie Toaster who I also like (who's meant to be irritating anyway).