Prince of the Planet Potters!
That episode "White Hole" actually led to a script glitch later on in "Demons and Angels".
“I tell you one thing. I've been to a parallel universe, I've seen time running backwards, I've played pool with planets, and I've given birth to twins, but I never thought in my entire life I'd taste an edible Pot Noodle." - Lister, Demons and Angels
The problem being that the whole point of the White Hole was that it was 'spewing' time, and when they blocked it off the time thread they were on would disappear and what they had done in that episode would not have happened. So how did Lister recall potting the planet?!?
Obviously a blonde moment ----->