 | Barbara Steele als Princess Asa Vajda / Katia Vajda |
 | John Richardson als Dr. Andrej Gorobec / Dr. Andreas Gorobec |
 | Arturo Dominici als Igor Javutich / Javuto |
 | Ivo Garrani als Prince Vajda |
 | Andrea Checchi als Dr. Choma Kruvajan / Dr. Thomas Kruvajan |
| Enrico Olivieri als Prince Constantine Vajda |
 | Antonio Pierfederici als Priest |
| Tino Bianchi als Ivan - Manservant |
 | Clara Bindi als Inn Keeper |
 | Germana Dominici als Sonya - Innkeeper's Daughter |
 | Renato Terra als Boris - Stablehand |
| Mario Passante als Nikita - Coachman |
 | Nando Gazzolo als Narrator (voice) (uncredited) |
| Mario Bava | Special Effects |
| Mario Bava | Director |
| Mario Bava | Director of Photography |
| Massimo De Rita | Producer |
| Mario Serandrei | Editor |
| Mario Serandrei | Screenplay |
| Tina Grani | Costume Design |
| Nikolai Gogol | Short Story |
| Bona Magrini | Script Supervisor |
| Eugenio Bava | Sculptor |
| Armando Govoni | Production Secretary |
| Ennio De Concini | Screenplay |
| Antonio Rinaldi | Gaffer |
| Lionello Santi | Executive Producer |
| Ubaldo Terzano | Camera Operator |
| Giorgio Giovannini | Production Design |
| Mario Bava | Matte Painter |
| Luigi Urbini | Conductor |
| Roberto Nicolosi | Original Music Composer |
| Paolo Mercuri | Unit Manager |
| Nedo Azzini | Set Decoration |
| Vana Caruso | First Assistant Director |
