1) The loss of Red Dwarf - they lose it, look for it, find it...this would involve footage from seasons 5,6,7 & 8
2) The death of Rimmer - the whole Ace Rimmer storyline
3) The birth of Lister - this is the one I'm playing with, simply because I need less 'proper' footage from the previous video-shot episodes, but it does need to time drive to be introduced because this is how Lister places himself under the pool table