I just picked up, and watched, the DVD of OPERACION 67 starring Santo, Jorge Rivero, and Elizabeth Campbell. I have seen only a handful of Santo films, but this one was by far the most entertaining, for me. Not much horror or sci-fi, but more like a James Bond 007 film.

The DVD is easy to find but has no subtitles...however, I had no problem at all following the movie (and I do not know a lick of Spanish).