The formidable K.O. Bouillon killed trainer Victor's colt during a boxing fight. Strongly affected, Victor returns to the south to find his wife and adopted daughter. He discovers in the person of Bernard a seed of champion which he ensures the training in secret...

Lucien Baroux
Victor

Jules Berry
Charlie
Jean-Marie Boyer
Jacky

Mercédès Brare

Blanchette Brunoy
Sylvette
Philippe Dancourt
Suzanne Dehelly
Antoinette
Philippe Derevel
Marcel Dieudonné
Paul

Georges Flamant
K.O. Bouillon

René Fluet
Boxer friend

Jimmy Gaillard
Bernard

Albert Malbert
Boss of the bistro

Maurice Marceau
Spectator

Jean Morel
Spartan