In 1912, the Alsatian Albert Schweitzer, missionary doctor and musician, goes to Gabon, a French colony, to fight malaria, which is ravaging the population. Administrator Leblanc takes a dim view of his arrival. But Albert can count on the devoted Marie Winter and Father Charles to assist him in his task.
| Actor | Role |
|---|---|
 Pierre FresnayDr. Albert Schweitzer | Dr. Albert Schweitzer |
 Raymond RouleauLe commandant Lieuvin | Le commandant Lieuvin |
 Jean DebucourtLe père Charles | Le père Charles |
 André ValmyL'administrateur Leblanc | L'administrateur Leblanc |
 Jeanne MoreauMarie Winter | Marie Winter |
 Georges ChamaratLe professeur | Le professeur |
 Michel MarsayJean | Jean |
 Jean LanierMonsieur Cristal | Monsieur Cristal |
| JJany VallièresMadame Cristal | Madame Cristal |
| CCandy WellJoseph | Joseph |
| SSoumah ManguéNot listed | Not listed |
| AAbdoulaye DraméNot listed | Not listed |
 André WasleyNot listed | Not listed |
| MMarie WinterNot listed | Not listed |
| RRoger Bontemps(uncredited) | (uncredited) |
| JJean Brunel(uncredited) | (uncredited) |
 Jean Yanne(uncredited) | (uncredited) |