Red Dwarf: Ouroboros

As the bug is attacked by Listers spurned Gelf bride two realities are joined and an alternate Christine Kochanski comes on board. Lister finally finds out who his parents are and why he was left under a pool table in Liverpool all those millions of years ago. As Kochanski falls from the dimensional link into non space she decides to stay, but only if Lister can save her life.