Pierre Fresnay

Professor Louis Delage

Renée Devillers

Florence Delage

Claire Duhamel

Catherine Delage

Marcel André

Doctor Charles Tannard

Nadine Alari

Yvette

Roland Alexandre

Jacques Brulages

Pierre Destailles

Gaston Berval

Georgette Anys

Mrs. Berval

Philippe Mareuil

Georges

Jean-Claude Pascal

Marcillac

Maurice Ronet

François

Claude Nicot

Barby

Madeleine Barbulée

Marie-Laure

Robert Moor

Professor Peccavi

Ky Duyen

Chang, butler

Émile Genevois

Gaston's friend

Raymond Galle

Doctor

Christian Fourcade

Émile

Elisa Lamotte

Lady of Orléans

Judith Magre

Bernard Musson

Assistant to Doctor Delage (uncredited)

Julien Maffre

Patient (uncredited)

Jacques Monod

Gendarme (uncredited)

Dominique Marcas

(uncredited)

Frédérique Hébrard

(uncredited)