There are a few things that do save Cauldron of Blood from total doom. The scenery is very picturesque then again this is Spain we're talking about, the animated title sequence is brilliant and the best scene of the film easily(sadly also one that deserved a much better film), Boris Karloff's presence is still magnetic despite his health and Viveca Lindfors is wonderfully nasty and in a rather scary way. In the acting stakes though Karloff and Lindfors are the only ones that come off as remotely well. Jean-Pierre Aumont looks thoroughly disengaged and as though he didn't want to be there, and others like Rosenda Monteros and Ruben Rojo over-compensate wildly and painfully. Cauldron of Blood is devoid of tension, suspense and chills, mainly because of how cheaply rendered the atmosphere is and also because of the appallingly cornball script- if you get any chills it will be from this component alone, the writing really is that bad- and how much the weirdly constructed story drags, to the extent that the only feeling you get from watching Cauldron of Blood is boredom. The pacing is erratic, on the ponderous side rather than rushed mostly, and the ending is anti-climatic and poorly resolved. Apart from the scenery and animated sequence, Cauldron of Blood is not a well-made film at all, the effects are hokey and the camera work is as erratic as the pacing but worst of all is the editing which is all-over-the-place, slow and choppy in feel and look and it was clear that the making of the film was spread out over a few years which seriously affects the continuity. The music is more strident and over-bearing than stylish and atmospheric. So overall, not Karloff's worst film, it's much better than those wretched Mexican films he made in a similar time frame to this( especially Fear Chamber, though one of them- The Incredible Invasion- made for one of the worst final films of any actor), but it is far from one of his best. If we were to just exclude the Mexican films for a brief second, Cauldron of Blood is still down there with The Invisible Menace and Voodoo Island as one of his weakest. A very generous 4/10. Bethany Cox

"Cauldron of Blood" (aka "Blind Man's Bluff") is a badly-made crime thriller that wastes poor, ailing Boris Karloff and doesn't really succeed in any other respect, either. Karloff portrays a famous sculptor who was blinded and partially crippled in a car accident years before. Sadly, there wasn't much acting involved in this role; the beloved British actor was seriously ill and it showed. As his snarling wife, Viveca Lindfors steals the show. Unbeknownst to Karloff, who thinks she's merely robbing graves, Lindfors (along with her thuggish lover) is actually murdering young women and giving their skeletons to Karloff, who uses them as armatures for his sculptures. If this doesn't sound like a very frightening or suspenseful premise, that's because it isn't. You're never shocked or scared or inclined to sit on the edge of your seat while watching "Cauldron of Blood", though it might be of some interest if you like watching weird, rude Europeans who begin every other sentence with the words "Between you and me..." As far as I'm concerned, the only intriguing elements of the film were Lindfors' creepy, leering lesbianism (and Nazi bondage nightmares), the animated title sequence, and the picturesque Spanish shooting locations. Even Karloff completists will be asking themselves why they bothered to see this one.

Legendary Boris Karloff is completely wasted in this mind-numbingly boring piece of trash.At the end of his life,seriously ill he plays the blind and crippled Charles Badulescu,a famous sculptor.He works on his final magnum opus completely unaware that the bones he has been using are the remains of the victims of his murderous wife."Cauldron of Blood" is a chore to sit through.The acting is painfully bad,the suspense is non-existent and the editing is awful.The film is terribly boring and filled with tons of uninteresting talking.The only reason to watch this utterly worthless bore is Karloff,but even his classy performance can't save it.Avoid this one like the plague-you'll thank me later.1 out of 10.

Producer Robert D Weinbach originally wanted Claude Rains for the role of Badulescu, but due to Rains's illness, he was replaced by Karloff. Originally titled Blind Man's Bluff, the film was shot in and around Madrid. Filming began in Februrary 1967 and lasted almost three months. Karloff was in ill health himself, but never wanted to give up acting and worked in his craft until he died in 1968. Karloff worked hard as a laborer and even a truck driver between acting roles when he was first starting out in Canada and knew what it was to miss a few meals. Karloff made this film a classic and it will be viewed and talked about from generation to generation whether we like it or NOT!