Roger Hanin

Géo Paquet, aka 'Le Gorille'

Charles Vanel

Berthomieu aka 'Le Vieux'

Ursula Herwig

Luise Keibl

Jess Hahn

Ted the Hook

Wolfgang Preiss

Otto Lohn

Michel Thomass

Boris Almazian

Viktor Tacik

Keibel

Yves Barsacq

Berthier

Micheline Gary

The blonde

Claude Vernier

Rosberg

René Havard

Chemist

Ton Kuyl

Wilhelm

Jean Juillard

French delegate

Lutz Gabor

Frantz

Pierre Collet

Bergère

Don Ziegler

Suzanne Dehelly

Hortense

Jack Ary

(uncredited)

Lucien Blondeau

(uncredited)

Pierre Grasset

(uncredited)

Richard Larke

English Commissioner (uncredited)

Peter Lewis

American spy (uncredited)