El Cerebro

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

Dominique Zardi Warden of Poissy Prison

Max Montavon Antique Dealer in Le Havre, Jean-François’ Partner

Paul Mercey André, the Flooded Owner of the 5th Floor

Henri Attal Member of the Colonel's Gang