Den fantastiske Brain

Jean-Paul Belmondo

Arthur Lespinasse

Bourvil

Anatole

David Niven

Colonnel Carol Matthews, Aka 'Le Cerveau'

Eli Wallach

Frankie Scannapieco, Godfather of the Italian Mafia

Silvia Monti

Sofia Scannapieco, Frankie's Sister

Raymond Gérôme

Commissioner

Fernand Guiot

Inspector Mazurel, Assistant to the Commissioner

Jacques Balutin

Inspector Pochet

Jacques Ciron

Inspector Dubœuf

Patrick Préjean

Belgian Sergeant of the Armoured Car

Robert Dalban

Belgian Soldier of the Armored Car (With a Cold)

Raoul Delfosse

Belgian Soldier of the Armored Car

Roland Monk

Belgian Soldier of the Armored Car

Mario David

Jean-François, Antique Dealer in Le Havre

Henri Génès

Chief Warden of Poissy Prison

Yves Barsacq

Warden of Poissy Prison