Phil Kay, Mark Davis, Marina Alexis Lace, Victoria Harrild, and Michaela MacKensie star.
- In the film we have Miss Allerton, but in the book it is Miss Allerton(s), and they are elderly spinsters, not a young woman.
- Dr. Saunderson is a man in the book.
- The Terror in Blue John Gap has nothing to do with Ancient Gods, but a creature from the prehistoric age that has been preserved in an prehistoric like utopia that exists under the caverns.
- Sherlock Holmes nor Father Baskerville are characters in the book.
Otherwise, a lot of the original dialogue and key plot elements are reminiscent to the story.