I saw the beginning of this movie on the Saturday Sci-fi-o-rama show (I really wish I could remember the name of it) and it really scared me. remember, this would have been the early 70s and I would have been about 7 or 8. it scared me enough that I didn't sit through the end of it.
now that I have watched the movie, I really enjoy it for what it is and what it tries to do. it makes the best of it's budget and the Slime People costumes are pretty cool. of course, having El Santo show up to save the day would make it perfect, but alas, that wasn't thought of then. if I had the know how to do one of those mash up trailers I certainly would make "El Santo vs the Slime People"!