Watched the Mystery Science Theater episode, and i was actually surprised that this isn't too bad of a movie. Definitely some things of merit going on here that makes it a enjoyable campy B movie to check out. (Some of the camera work, acting- not to mention the fight scene later in the movie, in the hotel room that stylistically caught me off guard, which I was impressed seeing, even if it is too short lived)
The chemistry between Forsythe and Margaret is great because they're such opposites. He's super straight laced, and she's wild. Unfortunately her acting isn't consistent. It's notable for a crazy scene at the 1hr 17min mark. There's a fight with the main 4 characters sped up that is fascinating to watch over and over again. It was probably done so you won't focus too much on Forsythe's stuntman. Crazy man!
Ann-Margret's over the top energy and John Forsythe's stodgy befuddlement play an excellent counterpoint in this extraordinary campy pulp drama. For all its B-movie bravado, this is really some sharp filmmaking from writer-director Douglas Heyes, with some expertly-crafted suspense, great moody black and white photography, and a simmering jazz score. A strange, sexy cult masterpiece.