aka Autopsia de un Fantasma
How bad is it? It was not made available for English-speaking audiences for 40 years.
Should you see it? It's only for Mexican horror fans and those interested in the stars.
This film has only recently been made available in a subtitled version, which seems odd given that it stars Basil Rathbone, John Carradine and Cameron Mitchell. Rathbone, in his last role, plays a ghost that after 400 years can redeem himself by getting a woman to fall in love with him. Carradine plays Satan, complete with horns and tail, but disappears for much of the film. It's actually worse than the four Mexican films that Karloff did at the end of his career.