I agree with some comments made previously and I also disagree with a few comments. I concur that this movie has the feel of something from the 1930's that somehow got filmed in color. In my opinion that's not a bad thing cause I love the old suspense films from that era. Make no mistake, this is a C film working with very few resources. Its not a huge stretch to compare this movie with The Terror, the Corman/Karloff/Nicholson epic. There are similarities. The action takes place near the ocean in a creepy old castle with a creepy old man, there is a mysterious and very lovely girl, there is a mystery about the old man's wife, etc. etc. Dungeon of Harrow is sorta and even lower budget version of that low budget classic which I actually loved. There are some very cheesy moments which would have best been left out. The shipwreck is lame, the skimpy Santa Claus outfit Mantis wears is kinda really dumb, and the painting of the Manor is pretty weak.
It doesn't help much that the leading man has zero acting ability. He does kinda look the part which helps. Also, the film moves very slowly at times. However, the overall effect is sorta like watching some surreal play while doing acid. Not a bad thing!
The big payoff for me were the scenes when the leading man is tossed into the dungeon which was more like a massive tomb. What he encounters there actually manages to bring the audience a few moments of rather stark anxiety. The scenes in the "tomb" were awfully effective, I was creeped out.
I am familiar with some of the Director, Pat Boyette's, comic book illustrations. The man had an imagination and the ability to create weird visual images. At the end of the day this movie is one of those "what might have been with more money, real actors, real special effects, and a more experienced director." However, it still manages to be rather watchable for its bizarro value and some out of the box experimentation. I gave it a five because I did enjoy it reasonably well. Its quite a trip if you're into stuff that is sorta "out there." Check it out, its still showing somewhere out there on Planet Weird.