"Doctor, we are caught up in a terrifying mystery".
| Actor | Role |
|---|---|
 René CrestéThe Adventurer Jacques d'Athys | The Adventurer Jacques d'Athys |
 Georges BiscotPlacide | Placide |
| ÉÉmile AndréDoctor Davesnes | Doctor Davesnes |
 Louis LeubasThe Asian - Kistna | The Asian - Kistna |
 Gaston MichelDoctor Gilson | Doctor Gilson |
 Mary HaraldTih-Minh | Tih-Minh |
 Georgette FaraboniMarchioness Dolorés de Santa Fe | Marchioness Dolorés de Santa Fe |
 Jeanne RolletteRosette | Rosette |