Les Grands Enfants does not tell a story in the traditional sense. Instead, it offers an honest image of people's dreams of change : people often unemployed, dissatisfied in some way with their work, or caught up in complicated social relationships. The film is set in Montreal.
| Actor | Role |
|---|---|
 Gilbert SicotteFrançois Gagné | François Gagné |
 Julie VincentJeanne Rossi | Jeanne Rossi |
 Robert GravelJean-Claude Mercier | Jean-Claude Mercier |
| JJean MathieuLéo Lafrance | Léo Lafrance |
| MMarielle BernardMarielle D'Amour | Marielle D'Amour |
 Rita LafontaineNot listed | Not listed |
 Béatrice PicardNot listed | Not listed |
| RRenée GirardNot listed | Not listed |
 Gaston LepageNot listed | Not listed |
 Amulette GarneauNot listed | Not listed |
 Pauline MartinNot listed | Not listed |
 Claude GaiNot listed | Not listed |
| RRoger TurcotteNot listed | Not listed |