Also Known As:
- Llamado de ultratumba
- Daimones tou skotous
- Das Teufelsritual
- Diables des ténèbres
- Diavoloi tou skotous
- Gruft der toten Frauen
- I diavoli delle tenebre
- Los diablos de la oscuridad
- Orgie noire
- Orgie satanique
- Talisman
- Lance Comfort
- Lyn Fairhurst
- William Sylvester ... Paul Baxter
- Hubert Noël ... Count Sinistre aka Armond du Moliere (as Hubert Noel)
- Carole Gray ... Tania
- Tracy Reed ... Karen Steele
- Diana Decker ... Madeleine Braun
- Rona Anderson ... Anne Forest
- Peter Illing ... Inspector Malin
- Gerard Heinz ... Bouvier - the Hotel Manager
- Brian Oulton ... The Colonel
- Walter Brown ... Bruno
- Eddie Byrne ... Dr. Robert Kelsey
- Victor Brooks ... Inspector Hardwick
- Marie Burke ... Old Gypsy Woman
- Marianne Stone ... The Duchess
- Avril Angers ... Midge
- John Taylor ... Sgt. Miller
- Frank Forsyth ... Antique Shop Caretaker
- Geoffrey Kenion ... Keith Forest
- Rod McLennan ... Dave
- Murray Kash ... Gypsy Chief
- Burnell Tucker ... Derek
- Margaret Denyer ... Tania's Mother
- Olwen Brookes ... Landlady
- Billy Milton ... Librarian
- Julie Mendez ... Specialty Snakedancer (as Julie Mendes)