Claudius finds a foal and takes it home to his boss. The men who stole the animal are looking for him. Claudius names him Champignol and trains him for racing. When he grows up, Champignol wins a regional race. But the thieves return, and Claudius is forced to do odd jobs to keep his horse.

Jean Richard
Claudius Binoche

Michel Serrault
Hector

Michel Barbey
'Chef' Patrice

Martine Sarcey
Madeleine

Alfred Adam
Antoine

Clément Michu
Berluron

Denise Benoit
Juliette

Robert Rollis
Gustave
Richard Marsan
Fred

Albert Michel
Peasant

Béatrice Altariba
Evelyne

Gérard Croce
Consumer

Christian Brocard
Motorcyclist

Gabriel Gobin
Larivière

Jacques Préboist
Taxi driver