[4] The film was shot in Hi-Fi 70mm 3-D, but was only shown that way at a brief engagement in Munich, Germany, and in several select theaters in Hollywood (reviews mentioned the 3D effects looked somewhat shoddy).

[5] The film is available on DVD from Shriek Show as Frankenstein's Bloody Terror, as well as on a German Blu-Ray (Region 2) under the title Die Vampire des Dr.

After killing innocent victims in the midst of his transformation, he seeks help from specialists, Dr. Janos de Mikhelov and his wife, who turn out to be two vampires, who then prey on both Janice and Rudolph, Waldemar's friends.

La Marca del Hombre Lobo was the first in a long line of werewolf films that would make Paul Naschy world famous.

Naschy wrote an autobiography, which included his first encounter with the werewolf mythology in a movie theater as a young child in 1945.

To justify this odd choice of title, an animated opening sequence especially created for the film explained that a branch of the Frankenstein family became cursed with lycanthropy and took the name Wolfstein.

La Marca del Hombre Lobo was filmed in Jan Jacobsen’s Hi-Fi Stereo 70 3-D format.

When Sherman learned this, he was persuaded by other investors to hire optical effects maestro Linwood Dunn to create single-strip, over-and-under 35mm prints for American release.

The final results were reportedly beautiful to look at when projected through high-quality 3-D lenses (such as those created by Robert V. Bernier for Space-Vision), but a celebrity-studded Hollywood premiere was completely undone when Sherman’s fellow investors provided shoddy acrylic lenses for the projectors; hence from then on, it was only shown in Germany in 70mm 3-D. A home 3-D release was held up for many years due to the rightsholders preventing the original 70mm negatives from leaving Spain; however, on September 15, 2024, it was announced that a complete 35mm over-and-under print had been discovered and was being scanned in 4K for a Blu-ray release in early 2025.