"Guitry reprises his role as Pasteur which he played successfully at the Vaudeville Theatre in 1919."
Sacha Guitry
as Louis Pasteur
Maurice Schutz
as Grandfather
José Squinquel
as Émile Roux
Jean Périer
as Doctor
André Marnay
Pierre Labry
Armand Lurville
as The first witness
Camille Cousin
as The second witness
Henry Bonvallet
as Sadi Carnot, President of the Republic
Gaston Dubosc
as President of the Academy of Medicine
François Rodon
as Little Joseph Meister
Louis Maurel
as Jules Guérin
Louis Gauthier
as Poggiale
Pierre Athon
as Student
Pierre Huchet
as Servant (uncredited)
Camille Beuve
as Joseph Lister (uncredited)
Julien Bertheau
as Student (uncredited)
Gaston Allain
Félix Clément
Jean Francey
Pierre Monda
as Little boy (uncredited)
Charles Vissières
as Frémy, old doctor (uncredited)
Director
Robert Gys
Set Decoration
Writer
Fernand Rivers
Producer
Jean Bachelet
Director of Photography
Louis Beydts
Original Music Composer
