People talk and talk about fog-wall-building slime people we never get to see because of, well, the fog. Actually, people seem to talk a lot about stuff that happens in The Slime People and we don't get to see it because of the fog. Briefly, the slime people eventually make a foggy appearance, but it's tough to see because of the fog. In fact, it's foggy whenever something other than talking about slime people happens, and maybe they should have called this movie The Fog People.
No, not that movie. This movie.