Trivia

One of the many films that Peter Cushing made about this time to help pay for the health treatments of his beloved wife, Helene. She would later die of emphysema in 1971.

Peter Cushing considered this to be the worst of his many films.

First film of Roy Hudd. He reportedly replaced much of the scripted dialogue with his own material.

Basil Rathbone was due to play a part in the film but died before filming started.

Robert Flemyng reportedly hated working on the film.