Cedric Hardwicke

as Captain Alfred Dreyfus

Charles Carson

as Colonel Georges Picquart

George Merritt

as Émile Zola

Sam Livesey

as Fernand Labori

Beatrix Thomson

as Lucie Dreyfus

Garry Marsh

as Major Ferdinand Walsin Esterhazy

Henry Caine

as Colonel Hubert-Joseph Henry

George Skillan

as Major Armand du Paty de Clam