This dramatized short film describes the historical mystery of France's "man in the iron mask". King Louis XIV imprisoned a man who was never identified, but who was forced to wear an iron mask for the length of his captivity, which ended only in his death. Several candidates for the identity of the man are investigated.
| Actor | Role |
|---|---|
| JJohn NesbittNarrator (voice) | Narrator (voice) |
| CCarlos De ValdezBit Part (uncredited) | Bit Part (uncredited) |
| JJack DeeryBit Part (uncredited) | Bit Part (uncredited) |
| IIvo HendersonBit Part (uncredited) | Bit Part (uncredited) |
 Mary HowardLa Vallière, The King's Sweetheart (uncredited) | La Vallière, The King's Sweetheart (uncredited) |
| GGeorge W. JimenezSpanish King (uncredited) | Spanish King (uncredited) |
 Edward KeaneNicholas Fouquet (uncredited) | Nicholas Fouquet (uncredited) |
 Michael MarkPeasant (uncredited) | Peasant (uncredited) |
| AAndre MarsaudonBit Part (uncredited) | Bit Part (uncredited) |
| TThomas R. MillsGovernor (uncredited) | Governor (uncredited) |
 Leonard PennLouis XIV, The Man in the Iron Mask (uncredited) | Louis XIV, The Man in the Iron Mask (uncredited) |
| GGeorge SorelCount Mattioli (uncredited) | Count Mattioli (uncredited) |
 E. Alyn WarrenBit Part (uncredited) | Bit Part (uncredited) |
| LLyons WicklandThe Mask (uncredited) | The Mask (uncredited) |
 Harry WorthLouis XIII (uncredited) | Louis XIII (uncredited) |