as Lorentzen, alias "Naalen"
as Gudrun, laboratorieassistent
as Larsen, kriminalkommissær
as Alex Birk, stud. med.
as Oscar, Naalens håndlanger
as Stefan, Naalens håndlanger
as Værtinden
as Helmer, kriminalassistent
as Fru Larsen
as Danselærerinde
as Leder på insulinfabrikken
as Lægen
as En sortbørshaj
as Skolepedellen
as 1. filmoperatør
as 2. filmoperatør
as En laboratorieassistent