Ernest and Celestine are travelling back to Ernest's country, Gibberitia, to fix his broken violin. This exotic land is home to the best musicians on earth and music constantly fills the air with joy. However, upon arriving, our two heroes discover that all forms of music have been banned for many years - and for them, a life without music is unthinkable. Along with their friends and a mysterious masked outlaw, Ernest and Celestine must try their best to bring music and happiness back to the land of bears.
| Actor | Role |
|---|---|
 Lambert WilsonErnest (voice) | Ernest (voice) |
 Pauline BrunnerCélestine (voice) | Célestine (voice) |
 Michel LerousseauNaboukov (voice) | Naboukov (voice) |
 Céline RontéKamelia (voice) | Kamelia (voice) |
 Lévanah SolomonMila (voice) | Mila (voice) |
| JJean-Marc PannetierOctavius (voice) | Octavius (voice) |
 Christophe LemoineChef police (voice) | Chef police (voice) |
 Georges CaudronJuge 1 (voice) | Juge 1 (voice) |
 Jean-Philippe PuymartinJuge 2 (voice) | Juge 2 (voice) |
| CCharlotte HennequinJuge 3 (voice) | Juge 3 (voice) |
| IIgor ChometowskiPolicier 2 (voice) | Policier 2 (voice) |
 Xavier FagnonOurs trafiquant (voice) | Ours trafiquant (voice) |
| TThierry BordasVoix d'ambiance (voice) | Voix d'ambiance (voice) |
| LLuc BouladVoix d'ambiance (voice) | Voix d'ambiance (voice) |
| AAntony DelcleveVoix d'ambiance (voice) | Voix d'ambiance (voice) |
| NNadine GirardVoix d'ambiance (voice) | Voix d'ambiance (voice) |
| TThierry WalkerVoix d'ambiance (voice) | Voix d'ambiance (voice) |
| CChristian PeythieuVoix d'ambiance (voice) | Voix d'ambiance (voice) |