Previously on High & Low, we’ve comprehensively and indisputably determined the ten best and five worst cast members’ other shows and DVD extras. With those contentious issues now settled once and for all, we turn to the topic of guest characters. Red Dwarf has always had such a strong core ensemble that it’s a rare occasion when an outsider takes centre stage. But memorable guest performers have often been used to enhance storylines, either for extra comedy value, a threat to the crew’s safety, or to build touching and emotional relationships. The best ones are usually a combination of at least two of the three, and it’s those that we celebrate here, along with some of those that failed to do any of them effectively.