It's 1941, but France is trapped in the 19th Century, governed by steam and Napoleon V. Avril, a teenage girl, goes in search of her missing scientist parents.
| Actor | Role |
|---|---|
 Marion CotillardAvril (voice) | Avril (voice) |
 Philippe KaterineDarwin (voice) | Darwin (voice) |
 Jean RochefortPops (voice) | Pops (voice) |
 Olivier GourmetPaul (voice) | Paul (voice) |
 Marc-André GrondinJulius (voice) | Julius (voice) |
 Bouli LannersPizoni (voice) | Pizoni (voice) |
 Anne CoesensChimène (voice) | Chimène (voice) |
 Macha GrenonAnnette (voice) | Annette (voice) |
 Benoît BrièreRodrigue (voice) | Rodrigue (voice) |
 Gérard Dessalles(voice) | (voice) |
 Jean-Claude Donda(voice) | (voice) |
 Damien Laquet(voice) | (voice) |
| IIrina Preda(voice) | (voice) |