Back to school for Ducobu, Léonie Gratin and Latouche. But this year, a major rival for Ducobu arrives at school: TGV, the king of cheating 3.0. While the financial situation of Saint-Potache becomes disastrous, the two dunces will have to unite their creativity to win a song contest and save their school.
Élie Semoun
as Gustave Latouche / Ghislaine Latouche
Émilie Caen
as Ghislaine Rateau
Frédérique Bel
as Adeline Gratin
Loïc Legendre
as Hervé Ducobu
Mathys Gros
as Ducobu
Leeloo Eyme
as Léonie Gratin
Chad Ebengue
as T.G.V.
Léopold Moati
as Willie
François Levantal
as le directeur de St-Potache
Florent Peyre
as le présentateur
Olivier Massart
as le directeur de Jean d'Ormesson
Norman Thavaud
as le père de Willie
