Terror desconocido

As others have noted, this is not great, but not terrible. There is something about it that just makes it fun to watch. I, too, remember it from my youth on Dr. Shock (a Philly-based horror movie show).

I recently scored a DVD copy of the film and thoroughly enjoyed it after a 35 year hiatus. I still enjoyed it.

It's one of those movies in which you can see that they spent some money on it, made sure to use real actors who were decent, write a decent script, and make sure they used good sets and locations.

Also, like others, the main thing I remember is the fungus. Oozing down cave walls, looking a bit like bath bubbles with an attitude! Fun stuff.