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