| Original title | L' Assassino...è al telefono | 
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| Danish title | The Killer - den der dræber | 
| International titles | Ein Mann geht aufs Ganze | 
| Leikstjórn | Alberto De Martino | 
| Screenplay | Adriano Bolzoni, Alberto De Martino, Renato Izzo, Lorenzo Manning, Vincenzo Mannino | 
| Director of Photography | Joe D'Amato | 
| Editor | Otello Colangeli | 
| Composer | Stelvio Cipriani | 
| Appearance | Telly Savalas, Anne Heywood, Rosella Falk, Osvaldo Ruggieri | 
| Land | Belgien, Italien | 
| Domestic distribution | Borg Film | 
| Technical info | 35 mm, 2,35:1 Scope, Eastmancolor, Mono | 
| Danish theatrical release | 24.04.1979 | 
| Cinemas | Metropol | 
| Find more | MFB, Dec. 1975, s. 256 | 
      Companies | 
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| Production company | Belga Films | 
| Domestic distribution | Borg Film | 
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      Instruktion | 
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| Instruktion | Alberto De Martino | 
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      Manus | 
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| Manus | Adriano Bolzoni | 
| Manus | Alberto De Martino | 
| Manus | Renato Izzo | 
| Manus | Lorenzo Manning | 
| Manus | Vincenzo Mannino | 
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      Produktion | 
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| Produktion | Aldo Scavarda | 
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      Foto | 
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| Foto | Joe D'Amato | 
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      Klip | 
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| Klip | Otello Colangeli | 
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      Musik | 
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| Musik | Stelvio Cipriani | 
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      Medvirkende | 
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| Ranko Drasovic | Telly Savalas | 
| Eleanor Loraine | Anne Heywood | 
| Medvirkende | Rosella Falk | 
| Thomas Brown | Osvaldo Ruggieri | 
| George | Giorgio Piazza | 
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