Based on a true story. In Léon Blum high school in Créteil (France), a history teacher decides to have her weakest 10th grade class take a national history competition. This will change them.
You can now watch Once in a Lifetime online on the following streaming providers in the United States.
| Directing | Marie-Castille Mention-Schaar | Director |
| Writing | Marie-Castille Mention-Schaar | Writer |
| Writing | Ahmed Dramé | Writer |
| Editing | Benoît Quinon | Editor |
| Production | Marie-Castille Mention-Schaar | Producer |
| Production | Pierre Kubel | Producer |
| Camera | Myriam Vinocour | Director of Photography |
| Production | Christophe Istier | Casting |
| Art | Anne-Charlotte Vimont | Production Design |
| Costume & Make-Up | Isabelle Mathieu | Costume Design |
| Costume & Make-Up | Valérie Théry-Hamel | Key Makeup Artist |
| Directing | Christian Sonderegger | Second Assistant Director |
| Sound | Ludovico Einaudi | Original Music Composer |
| Sound | Dominique Levert | Sound Mixer |
| Sound | Élisabeth Paquotte | Sound Editor |
| Sound | Christophe Vingtrinier | Sound Re-Recording Mixer |
| Directing | Joëlle Hersant | Script Supervisor |
| Directing | Zazie Carcedo | First Assistant Director |
| Production | Marie-France Michel | Casting |
| Visual Effects | Stéphane Bidault | Visual Effects Supervisor |
