I first heard of MARK OF THE DEVIL's notoriety when I was a teenager. It had this mythology along the lines of LAST HOUSE ON THE LEFT & I SPIT ON YOUR GRAVE. I couldn't find it anywhere though. Several years later I was hired to write and direct PART 6 (!) and the company sent me the original to view. While it didn't scare me, it definitely left some unnerving tension. As a historical piece, I found it painfully fascinating. If what the opening credits claim (This is all a true stroy), then it makes it's effect that much more profound. As a horror movie, it's okay. Nothing scary happens, though the blood and torture is what clearly lends it to the genre. You could watch worse, you could watch better. It's a decent time waster (plus it stars Udo Kier!) Good luck in trying to find any of the sequels, though. Part 3 was retitled SISTERS OF SATAN, PART 4 is actually TOMBS OF THE BLIND DEAD, Part 5 is actually RETURN OF THE BLIND - and yes, there is a MARK OF THE DEVIL 666 - the only sequel since PART 2 to be produced under the DEVIL banner!