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Ebbe Rode as Lorentzen, alias "Naalen" |
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Tove Maës as Gudrun, laboratorieassistent |
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Gunnar Lauring as Larsen, kriminalkommissær |
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Hans-Henrik Krause as Alex Birk, stud. med. |
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Louis Miehe-Renard as Oscar, Naalens håndlanger |
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Jørn Jeppesen as Stefan, Naalens håndlanger |
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Sigrid Horne-Rasmussen as Værtinden |
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Ove Sprogøe as Helmer, kriminalassistent |
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Tove Bang as Fru Larsen |
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Lise Thomsen as Danselærerinde |
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Hans Egede Budz as Leder på insulinfabrikken |
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Tavs Neiiendam as Lægen |
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Aage Winther-Jørgensen as En sortbørshaj |
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Henry Nielsen as Skolepedellen |
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Karl Gustav Ahlefeldt as 1. filmoperatør |
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Gyrd Løfqvist as 2. filmoperatør |
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Gunnar Strømvad as En laboratorieassistent |
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Gotha Andersen as |
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Axel Strøbye as |
| Sound | Sven Christensen | Sound |
| Production | Johan Jacobsen | Producer |
| Editing | Annelise Hovmand | Editor |
| Art | Steini Sveinbjörnsson | Production Design |
| Crew | Werner Hedman | Cinematography |
| Sound | Kai Møller | Music |
| Directing | Annelise Hovmand | Assistant Director |
| Writing | Johannes Allen | Writer |
| Production | Preben Philipsen | Producer |
| Directing | Johan Jacobsen | Director |
