Eddie Constantine

as Lemmy Caution

Anna Karina

as Natacha von Braun

Akim Tamiroff

as Henri Dickson

Valérie Boisgel

as 2nd Seductress Third Class (uncredited)

Jean-Louis Comolli

as Prof. Jeckell (uncredited)

Michel Delahaye

as von Braun's Assistant (uncredited)

Christa Lang

as 1st Seductress Third Class (uncredited)

Jean-Pierre Léaud

as Breakfast Waiter (uncredited)