The hit BBC sci-fi comedy series, Red Dwarf, with all its thought-provoking concepts, is built around one central theme: how do you cope when trapped somewhere with people you hate? It's British humour at its finest, and the show's first two seasons explore the sheer emptiness of deep space with hilarious ingenuity.
And while the hapless crew of Red Dwarf never encounter any real alien species, the third season onwards has them run into quite a collection of stranded survivors or man-made atrocities, from the hideous polymorph to the dimension-hopping hero Ace Rimmer.
Given their endless futile goal of returning to Earth, the four-man team never stay in one place very long, so most of the beings they come across have but one episode in the limelight. For some, that's enough, and for some, it would've been nice to see them again - but in both cases, many of these one-off faces left a lasting impression on both the characters and the audience alike.
As hard as it is to narrow it down, the following 10 one-time characters are the top picks for the best appearances in the series.