Mr. Peek-a-Boo

Bourvil

Léon Dutilleul

Joan Greenwood

Susan

Gérard Oury

Maurice

Henri Crémieux

Mr. Lécuyer

Roger Tréville

Félix Burdin

Jacques Erwin

Gaston

Frédéric O'Brady

The Medical Specialist

René Worms

An Employee at the Ministry

Nina Myral

Mrs. Eloise

André Dalibert

Nicole Riche

The Lady of the Second

Germaine Reuver

Mrs. Ménard, the Concierge

Jeanne Véniat

The South American

Georges Flateau

Mr Robert

Edmond Beauchamp

Arturo

Georges Lannes

The Director of the 'Prison de la Santé'

Marcelle Arnold

Germaine

Raymond Souplex

Jean-Paul

Nicolas Amato

The First Agent (uncredited)

Georgette Anys

Maria (uncredited)

Alfred Arlais

(uncredited)

Maurice Biraud

A colleague of Léon (uncredited)

Gérard Buhr

(uncredited)

Marcel Charvey

The bartender (uncredited)

Dominique Davray

A model (uncredited)

Skip Farrell

Maurice (uncredited)

Charlie Fawcett

(uncredited)

Fignolita

The negress (uncredited)

Charles Jarrel

(uncredited)

Franck Maurice

The Second Agent (uncredited)

Marcel Meral

A Colleague of Léon (uncredited)

Craddock C. Monroe

Elmer (uncredited)

Alain Raffael

(uncredited)

Nicole Rimbaud

(uncredited)

Titys

The Prisoner (uncredited)

Pamela Wilde

A Model (uncredited)

Payne Williams

Jean-Paul (uncredited)