It is the far future, and the moon has been colonised. Although primarily a research establishment, wealthy space tourists bring in revenue to fund the facilities. One major tourist attraction is a sightseeing cruise across the lunar plains: flat and smooth, they are composed entirely of dust. The 'cruise ships'...
Millions of years ago, the Ice Warriors fled to Deimos to sit out the death throes of their home planet, and it is now a popular tourist attraction. But it seems that the Ice Warriors are far from extinct...