I've heard of Red Dwarf, and seen most of the seasons. Doctor Who also. I first saw Doctor Who in the 80's on the local pbs affiliate. Red Dwarf was a few years ago when the local affiliate had most of the seasons.
As for science fiction films there are many sub genres and some folks do not like certain ones so they may not have heard of those certain films, and some of the alien films would be considered old by today's folks since anything over 6 months, or maybe 3 monts, are considered old films.