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.
| Directing | Alain Jessua | Director |
| Writing | André Ruellan | Writer |
| Writing | Alain Jessua | Writer |
| Production | Louis Duchesne | Executive Producer |
| Sound | Catherine Dubeau | Sound Editor |
| Editing | Michel Crivellaro | Assistant Editor |
| Editing | Hélène Plemiannikov | Editor |
| Production | Richard Dupuy | Unit Production Manager |
| Sound | Claude Villand | Sound Mixer |
| Lighting | Alain Tanguy | Electrician |
| Costume & Make-Up | Joël Lavau | Makeup Artist |
| Costume & Make-Up | Jacques Clemente | Makeup Artist |
| Costume & Make-Up | Jean-Marc Maniatis | Hairstylist |
| Directing | Annie Maurel | Script Supervisor |
| Editing | Thierry Thomas | Assistant Editor |
| Production | Alain Jessua | Producer |
| Camera | Jacques Robin | Director of Photography |
| Camera | Gilbert Duhalde | Camera Operator |
| Crew | Georges Demétrau | Special Effects |
| Sound | René Koering | Music |
| Sound | Costin Miereaunu | Music |
| Art | Constantin Mejinsky | Production Design |
| Costume & Make-Up | Christine Guégan | Costume Design |
| Sound | Alain Lachassagne | Sound |
| Sound | Michel Portal | Musician |
