Found this interesting fan theory on the Red Dwarf Wikia: This is something I'd never considered before. The Inquisitor's last words are, "all my glorious work will be undone" - which suggests that *people he replaced would be restored*. That a) gives a possible (in-universe) excuse for at least one cast change per characer and b) creates a bit of waggle-room, in terms of stuff that got retconned. In the suggestion above, Chloe-Kochanski was actually the *first* Kochanksi - but the Inquisitor replaced her with Clare-Kochanski. Then, when the Inquisitor died, Chloe-Kochanski was restored. This chimes nicely with the retconning, which established her as Lister's ex. It makes sense that Chloe's Kochanski would be willing to waste time with Lister. Clare's Kochanski took her goals more seriously - "seizing the gift of life" - and wasn't. The theory isn't watertight because of the timings. Kochanski became Lister's ex in series four, *before* the Inquisitor's work was undone. Equally, Kochanski still looked like Clare Grogan in Psirens, which was *after* Inquisitor. However, I like the theory enough that I'm prepare to shrug that off as "timey-wimey stuff". Maybe the universe was a bit unstable, and shimmered between two realities for a while? More generally, I think I'm going to consider this "trump card" for every bit of retconning. Undoing the Inquisitor's work would be a massive change, and there's the butterfly effect to consider. Who knows what effects it would have on established history...?