Infamously, this story was deemed so boring that they re-edited parts three and four into a single regular-length episode, i.e. this one. Probably for the best -- I can't imagine what they could've got up to for another 25 minutes!
3x05 Mordbrännaren (aka The Arsonist)
Whose Line is it Anyway?
2x07 (29/12/89 edition) [Christmas special]
[Watch it (again) on 4oD.]