Yeah Space use to do viewers choice marathons of some of its more popular shows and since Space's programming can only air certain things a certain amount of times. Thios means if a episode ends up in a marathon that means one less time it can be aired so anytime you see a episode not aired its either because of that or in some cases some shows on Space are aired not based on airdate but how the shows powers that be wanted the show to be aired. Your best bet is to checkout the monthly listings. On a side note I think Space has stated the disappointment of some episodes not airing in regular runs that they have done away with the marathons.
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