| Original title | Der Hexer |
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| Danish title | Massemorderen fra Back Street |
| International titles | The mysterious magician |
| Leikstjórn | Alfred Vohrer |
| Screenplay | Herbert Reinecker |
| Based on | Roman af Edgar Wallace. |
| Producer | Horst Wendlandt |
| Director of Photography | Karl Löb |
| Editor | Jutta Hering |
| Composer | Peter Thomas |
| Appearance | Joachim Fuchsberger, Heinz Drache, Sophie Hardy |
| Land | Tyskland |
| Danish theatrical release | 17.04.1967 |
| Cinemas | Vester Bio |
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| Production company | Rialto Film GmbH |
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Instruktion |
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| Instruktion | Alfred Vohrer |
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Manus |
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| Manus | Herbert Reinecker |
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Produktion |
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| Producer | Horst Wendlandt |
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Foto |
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| Foto | Karl Löb |
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Klip |
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| Klip | Jutta Hering |
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Musik |
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| Musik | Peter Thomas |
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Medvirkende |
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| Medvirkende | Joachim Fuchsberger |
| Medvirkende | Heinz Drache |
| Medvirkende | Sophie Hardy |
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