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Paul Naschy as Hector Doriani / Alex Doriani / Frankenstein's Monster / Mr. Hyde / Phantom of the Opera / Waldemar Daninsky the Werewolf / Quasimodo / The Devil |
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Caroline Munro as Carmen |
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Howard Vernon as Eric |
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Fernando Hilbeck as Father Damián |
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Joseph Garco as Biker Robber |
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Roberta Kuhn as |
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Carmen Plate as Woman |
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Mariano Vidal Molina as Civil Guard |
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Pascual Marco as |
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Tamara Greys as Bridgett |
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Mabel Ordóñez as Lola |
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Isabel Prinz as Lorena |
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Nuria Lucas as Robber Girl |
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Sergio Molina as Adrián (as Serge Mills) |
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Cris Huerta as Zacarías |
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Emilio A. Pina as Civil Guard 2 |
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Malena Gracia as Woman (uncredited) |
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Chema Gómez as (uncredited) |
| Sound | Fernando García Morcillo | Original Music Composer |
| Camera | Juan Antonio Cobo | Assistant Camera |
| Production | Augusto Boué | Producer |
| Production | Paul Naschy | Producer |
| Editing | Enrique Serrano | Assistant Editor |
| Production | Germán Monzó | Producer |
| Crew | Francisco García San José | Special Effects |
| Production | Federico Canudas | Production Secretary |
| Editing | Carlos Rojo | Assistant Editor |
| Camera | Emilio Ruiz | Still Photographer |
| Production | Emilio A. Pina | Assistant Production Manager |
| Writing | Paul Naschy | Screenplay |
| Crew | Julio Burgos | Cinematography |
| Directing | Paul Naschy | Director |
| Costume & Make-Up | Fernando Florido | Makeup Artist |
| Editing | José Antonio Rojo | Editor |
| Art | Tony Pueo | Art Direction |
| Writing | Salvador Sáinz | Screenplay |
