Science Fiction or Science Fact?

The first film came in 1951 and was called, “Superman and the Mole Men”; and it sounds like a terrible mis-match.  What special power might the Mole Men use against a man with limitless strength; x-ray vision (helpful underground); and an body impervious even to bullets? Might they employ their prodigious sense of smell or sharp little claws? Or did they perhaps have access to thermonuclear weapons? It mattered not, for they were not destined to clash head-on with the man in the red cape.