 Lister speaks to Kryten, telling him he understands that he's died in the future, but Kryten tells him that a "David Lister" is aboard the future ship, which seriously confuses Lister.Kryten explains that the future crew's time drive has malfunctioned and only allows them to go forwards.In order to fix it, they need to copy components from the time drive aboard the present "Starbug".