Doctor Valois has invented the "flashage", a cure for depressed people. After having tested it on monkeys, he tries with a first human patient, Alain Durieux. This is great success, everybody's happy except may be Alain's wife, Jeanne, who's worrying about the changes in Alain's personality. Other patients use the treatment with similar successes, and Valois's happy about it. But the monkeys are changing: non-cured ones are made mad by the over-stability and stereotyped behaviour of the cured ones. So are the humans. When Valois realises he can't stop the process, he decides to "flash" himself.
Patrick Dewaere
as Alain Durieux
Jacques Dutronc
as Pierre Valois
Fanny Cottençon
as Jeanne Durieux
Stéphane Audran
as Édith
Philippe Léotard
as Marc Lebel
François Dyrek
as le responsable du zoo
Anna Gaylor
as une agent d'assurance
Jean-Paul Muel
as le directeur furieux
Francis Lemaire
as le directeur de l'usine
André Thorent
as M. Borne
Patrice Kerbrat
as Armand
Jeanne Goupil
as Sophie
