Anne-Marie Loop as La Grise (voice)

Lambert Wilson as Ernest (voice)

Pauline Brunner as Célestine (voice)

Patrice Melennec as Georges (voice)

Brigitte Virtudes as Lucienne (voice)

Léonard Louf as Léon (voice)

Dominique Maurin as Chef de Clinique (voice)

Féodor Atkine as Juge Grizzly (voice)

Vincent Grass as Chef de la police des Ours (voice)

Patrice Dozier as Chef de la police des Rats (voice)

Jacques Ciron as Monsieur Rançonnet (voice)

Garance Pauwels as Célestine (enfant) (voice)

Pierre Baton as Juge Rat (voice)

Ethan Louis Samuels DiSalvio as Martin (voice)

Spike Spencer as Various Characters (voice)

Hunter Maki as Additional Voices (voice)

Maxime Bailleul as Additional Voices (voice)

Kémil Belhadj as Additional Voices (voice)

Yanis Belhadj as Additional Voices (voice)

José António Barbosa de Oiveira as Additional Voices (voice)

Swann Bey as Additional Voices (voice)

Simon Brunner as Additional Voices (voice)

Samuel Cahu as Additional Voices (voice)

Adeline Chetail as Additional Voices (voice)

Thierry d'Armor as Additional Voices (voice)

Michel Elias as Additional Voices (voice)

Jennifer Fauveau as Additional Voices (voice)

Ambre Foubert as Additional Voices (voice)

Nathalie Homs as Additional Voices (voice)

Warren Homs as Additional Voices (voice)

Pascale Jacquemont as Additional Voices (voice)

Gwenaelle Jegou as Additional Voices (voice)

Sofiane Larcher-Guessoum as Additional Voices (voice)

Emmanuel LeMire as Additional Voices (voice)

Ornella Louf as Additional Voices (voice)

Perrette Pradier as Head Nurse Mouse (voice)

Yann Le Madic as Avocat d'Ernest (voice)