Not really an action movie as you might be led to believe by the title and given the fact that these epics were invariably promoted with chunky poster art of Hercules holding a boulder aloft ready to drop it on some unfortunate adversary. In fact, he does manage to fill the mandatory quota of rock throwing in this particular sword and sandal outing but at other times it's a bit slow moving. Not that it really matters because it still has a lot going for it.
Apart from anything else, it's a gorgeous looking film. The sets, costumes, special effects and camera work are a joy to behold and director Mario Bava's distinctive style is very much to the fore. Bava specialized in the creation of surreal and subtly sinister atmospherics and there's plenty of that.
Reg Park had a vibrant and attractive screen presence and turned in a convincing performance as the muscle bound super hero. His fellow players were also well cast and provided (dare I say it ?) "strong" support. And there are enough suspenseful moments along the way to keep the sandman at bay.
You could never say that "Hercules in the Haunted World" moves along at a cracking pace. It's more like a pleasant, slow boat ride through a kaleidoscope of fairy tale images.