You won't find any truth in advertising here! This is a Grade Z production from Spain. No, it does NOT have either Boris Karloff or Lon Chaney Jr. anywhere in the film! Why someone at Universal did not sue the producers of this Little Gem, is beyond me. Maybe Universal did not have any lawyers who cared about such things in 1972.
If stealing a couple of Horror Icons images for their poster was not bad enough, get a load of the Hype from the Pressbook: Yesterday they were COLD & DEAD - TODAY - they're HOT & BOTHERED!