| Original title | La sfida |
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| Danish title | Udfordringen |
| Other titles | Edderkoppen fra Napoli |
| Leikstjórn | Francesco Rosi |
| Screenplay | Suso Cecchi d'Amico, Enzo Provenzale, Francesco Rosi |
| Director of Photography | Gianni Di Venanzo |
| Editor | Mario Serandrei |
| Composer | Roman Vlad |
| Production designer | Franco Mancini |
| Appearance | Rosanna Schiaffino, José Suarez, Nino Vingelli |
| Land | Italien, Spanien |
| Domestic distribution | Gloria-Film |
| Technical info | 35 mm, Normal, Sort-hvid, Tone |
| Danish theatrical release | 09.03.1967 |
| Cinemas | Camera |
| Danish rating | Forbudt for børn u. 16 år (1935-1969) |
Companies |
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| Production company | Lux, Rom Vides Film, Cinecitta/Suevia Films (Madrid) |
| Domestic distribution | Gloria-Film |
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Instruktion |
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| Instruktion | Francesco Rosi |
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Manus |
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| Manus | Suso Cecchi d'Amico |
| Manus | Enzo Provenzale |
| Manus | Francesco Rosi |
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Produktion |
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| Produktion | Franco Cristaldi |
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Foto |
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| Foto | Gianni Di Venanzo |
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Klip |
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| Klip | Mario Serandrei |
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Musik |
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| Musik | Roman Vlad |
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Produktionsdesign |
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| Produktionsdesign | Franco Mancini |
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Medvirkende |
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| Medvirkende | Rosanna Schiaffino |
| Medvirkende | José Suarez |
| Medvirkende | Nino Vingelli |
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