This is yet another in the inexplicably-popular "Dr. Orloff" series (those Europeans, eh? guess they'll watch ANYthing...). It USED to go by the title "The Invisible Dead", but this is it's actual release title.
It is an endurance contest - no kidding. Some friends and I used to joke about the VHS version we'd seen because it was about the ONLY film we'd ever seen that made "Red Zone Cuba" and "Manos" look fast-paced and exciting. In typical Euro-style, we get odd zoom-in close-up shots of the (mugging) faces of the supporting cast, a plot that drags on and on and on and on, and the "monster" is neither invisible NOR a man - if anything, it will remind you of the Ro-Man from "Robot Monster", only without the laughs. Special effects? Hah! Watch "footsteps" being made while the thing is "invisible" - these "steps" form at a pace indicating the monster has severe gout in both knees AND feet and will make it all the way across the room by this time next year.
Don't be fooled - there is NO saving this one. No riffs, no beer, NOTHING can prepare you for the unbelievable sadness, boredom, and general sense of "I wasted my time on THIS?!?!" that this movie will produce. I actually pride myself on having seen the entire movie, but that's so YOU don't HAVE to...