I think this is a new genre that they're all sort of working their way through it and haven't got all the kinks worked out yet but it's a genre that works for me.

Pretty Good

I have absolutely never seen anything like this movie before. You have to see this movie.

Through painfully honest and emotional moments, the movie becomes irresistibly relatable

One of the god awful Mexican horror films that Boris Karloff made in his final years and which were released after his death. Karloff was paid to shoot sequences for four films in Hollywood because Karloff was too ill to travel. These sequences were written and directed by Jack Hill who then handed the film over to a Mexican producer. The footage was then cut in with stories with actors who were filmed in Mexico and had nothing to do with the English footage. The result was pretty much truly awful films with Karloff seeming to have come in from a different planet because his performance was so much better then everything else. Here the plot has to do with some living rock found in a volcano deep that needs the hormones secreted by frightened women in order to stay alive. So the scientists make a chamber and scare unsuspecting women. Add in some other soap opera type stuff and you have a really bad movie.This is one of those turkeys that even bad film lovers like me stare at with slack jawed wonder and ponder if its worth continued viewing or if we should just hang it up. (not to mention its another of those films that makes you ponder why Ed Wood is the king of bad movies) For masochists or Karloff completeists only.1 out of 10

Pretty bad, even for a Mexican horror film. Boris Karloff plays a scientist trying to keep a mysterious life form alive by feeding it a brain chemical released by humans when they're terrified. A promising idea, but a woefully put together patchwork of a film. Jack Hill wrote the screenplay and directed Karloff's scenes and they're spliced together with scenes shot in Mexico. Hill's direction of Karloff is pretty bland stuff and the Mexican scenes hold no interest at all, certainly not the few decidedly out of place shots of women being tortured. Isela Vega (electrifying in Peckinpah's "...Alfredo Garcia") appears as "Helga" and shows absolutely zero charisma. This is one US/Mexican tapestry that's shy of quite a few threads.

With its rep as one of Karloff's worst, I expected something drab and stilted (like CAULDRON OF BLOOD, '67) so was surprised to find this quite colorful, albeit in a tacky way. While it lacks subtlety (and often coherence), the film delivers sufficient sleaze to please prurient drive-in dwellers.The haphazard script provides much to mock. Spellunking scientists discover and attempt to communicate with a tentacled, "intelligent" rock. That's all of the plot you need...it's raw gibberish. Amoral researchers stop just short of human sacrifice in their experiments, and place blind faith in primitive, printout-spitting computers. Rants from Roland, the diamond-obsessed comic relief, beg for MST3K skewering, and Karloff's scientific theories are the daffiest heard since mad docs roamed the Monogram lot.Most commenters cluck about "Poor Boris." Granted, he isn't tossed one morsel of decent dialogue, but he just phones his part in. (The young leads, on the other hand, are quite likable, even though their characters are not.) Upon his passing, rummagers of Karloff's effects discovered that his check for this flick was uncashed...perhaps he expected it to bounce.

With all due respect to the review above, I found this psychotronic classic delightfully fun. This is a Mexican-American co-production with the usual bad dubbing and cheesy sets, but if you love late '60's drive-in horror trash in the Joe Bob Briggs mold, you will NOT be disappointed! See! A rock monster who communicates in Moog™ noises! See! A goofy lug named Roland display his talents as a Tor Johnson wannabe! See! A Vegas style big band strip tease with breasts and bare white walls for a backdrop! See! Boris Karloff do his level best to bring some class to this low budget, bloody romp...and succeed! One final note of warning...this film is currently offered as part two of a double feature DVD that RetroMedia has put out (it's also available for rent on Netflix); the first flick, "Island Monster," (1954) is absolutely terrible. Do NOT watch "Island Monster"!! It has NO redeeming value WHATSOEVER! You have been duly warned.