Joachim Gottschalk

as Engelbrecht, Chemiker

Ernst von Klipstein

as Dr. Paul Gildemeister, Chemiker

Hertha Feiler

as Barbara Wrede

Paul Hoffmann

as Dr. Wrede, Barbaras Bruder

Siegfried Schürenberg

as Dr. Marlow, Werkslaborant

Walter Werner

as Hedemeier, Prokurist

Gerhard Dammann

as Julius Hückebusch, Werkmeister

Gerhard Bienert

as Müller, Lagerverwalter