Lino Ventura as Géo Paquet, Le Gorille

Charles Vanel as Colonel Berthomieu

Pierre Dux as Veslot

Bella Darvi as Isolène

René Lefèvre as Commissioner Blavet

Robert Manuel as Casa

André Valmy as Mauricet

Henri Crémieux as X.A. Pallos

Jean-Roger Caussimon as Léon

Jean-Max as Councilor Smolen

Jean-Marie Rivière as Valério

Yves Barsacq as Berthier

François Darbon as Popaul

René Bergeron as Antoine Legrand, first hygiene inspector

Maurice Chevit as Second hygiene inspector

Guy Mairesse as Killer

Jacques Seiler as Principal Inspector Antier

Robert Berri as Combinat

Jean-Pierre Mocky as Sébut

Marie Sabouret as Chaboute

Jean Mercure as Director of the DST