The ship was being eaten by a engineered virus, so they all abandoned ship. Our 4 stayed behind to try and fix it. The assumption is, in the gap, they did manage to get the antidote from the mirror universe and save the ship (this was the originally intended ending to Series 8, seen here ). Then the now resurrected living Rimmer must've died again, and Kochanski left.
So because I haven't paid attention, what happened between Red Dwarf and the whole crew being rebuilt by nanobots in the latest ones I watched, and what appears to be just Lister, Rimmer*, Kryten and Kat alive in the latest trailers?
*Realise he's not actually alive.
Not that such things have much meaning in a show where characters can have their appendix taken out repeatedly
Edited by DFawkes at 16:40:39 04-10-2012
Oh for goodness sake, I've caught my scrotum in my zip again - Margaret Thatcher, 1986