Great for a Saturday or Sunday afternoon, I remember seeing this when I was a kid, and to this day from time to time I watch it. Frankly I think it's the greatest film Christopher Lee and Peter Cushing made together, and possibly because it wasn't touched by Hammer, made awesome magic. Obsession for the unknown leading to practices of Black Magic at any cost to get the skull of DeSade...well, there's an old saying be careful what you wish for...you may get it, and the skull of DeSade--like Black Magic itself--gets a mind of its own with bad outcomes.