Margot and Marguerite are 12-year-old girls who seem no different from any other youngsters with the usual family and peer problems. While they appear to have similar faces and body shapes, they wear different clothes and hairstyles, but the biggest difference between them is that one lives in 1942 and the other in 2020. When the girls crawled into a wooden chest they were magically sent into each other’s timeline, and because the girls look so similar their family and friends do not notice the swap.
| Directing | Pierre Coré | Director |
| Production | Michel Cortey | Producer |
| Production | Pierre Coré | Producer |
| Production | Marie de Cenival | Associate Producer |
| Production | David Giordano | Executive Producer |
| Production | Clément Miserez | Producer |
| Production | Christian Ronget | Producer |
| Production | Ardavan Safaee | Producer |
| Production | Matthieu Warter | Producer |
| Sound | Jérôme Rebotier | Original Music Composer |
| Camera | Jean-Paul Agostini | Director of Photography |
| Editing | Jeanne Kef | Editor |
| Production | Sylvie Brocheré | Casting |
| Art | Jean-Philippe Moreaux | Production Design |
| Costume & Make-Up | Pascale Bouquière | Key Makeup Artist |
| Costume & Make-Up | Valérie Chapelle | Makeup Artist |
| Art | Lionel Pouchard | Storyboard Artist |
| Art | Lara Schneider | Assistant Art Director |
| Directing | Hugo Marchand | Third Assistant Director |
| Directing | Bonnie Pirès | First Assistant Director |
| Directing | Amour Rawyler | Second Unit First Assistant Director |
| Directing | Jean-André Silvestro | First Assistant Director |
| Visual Effects | Thibault Chartier | Digital Compositor |
| Visual Effects | Irène Cunat | Digital Compositor |
| Visual Effects | David Danesi | Visual Effects Producer |
| Visual Effects | Théophile Dhuicque | Visual Effects Coordinator |
| Visual Effects | Thomas Duval | Visual Effects Supervisor |
| Visual Effects | Nicolas Lacroix | Visual Effects Producer |
| Visual Effects | François Masle | Digital Compositor |
| Crew | Franck Carpentier | Special Effects |
| Crew | Ronan Chiaradia | Special Effects |
| Crew | Gontran Desouche | Special Effects |
| Crew | Barthélémy Robino | Special Effects |
| Visual Effects | Benoit Talenton | Special Effects Supervisor |
| Camera | Christophe Hustache-Marmon | Second Unit Director of Photography |
| Camera | Benjamin Groussain | Steadicam Operator |
| Lighting | Johan Bors | Electrician |
| Camera | Ludovic Jacques | Grip |
| Camera | Marine Lebon | Second Assistant Camera |
| Camera | Johan Lecomte | Additional Grip |
| Camera | Léa Riceputi | First Assistant "B" Camera |
| Lighting | Michel Sabourdy | Gaffer |
| Camera | Nicolas Sommermeyer | Key Grip |
| Crew | Hugo Bariller | Stunts |
| Crew | Serge Beuchat | Stunts |
| Crew | Julien Bruant | Stunts |
| Crew | Damien Buffard | Stunt Driver |
| Crew | Pascal Guégan | Stunt Coordinator |
| Crew | Pascal Lopez | Stunts |
| Crew | Emilie Ricard | Stunts |
| Crew | Patrick Ronchin | Stunt Coordinator |
| Crew | Thierry Saelens | Stunts |
| Editing | Samuel Fassi | First Assistant Editor |
| Editing | Marjolaine Mispelaere | Digital Intermediate Colorist |
| Directing | Bérengère Saint-Bezar | Script Supervisor |
| Sound | Grégoire Chauvot | Sound Editor |
| Crew | Samuel Delorme | Mix Technician |
| Sound | Florent Denizot | Sound Mixer |
| Sound | Jean-Paul Hurier | Sound |
| Sound | Gildas Mercier | Foley Recordist |
| Sound | Charles Michaud | Sound Engineer |
| Sound | Jonas Orantin | Foley Editor |
| Sound | Clémence Stoloff | Dialogue Editor |
| Writing | Stéphane Kazandjian | Dialogue |
| Writing | Pierre Coré | Writer |
| Writing | Alexandre Coffre | Writer |