| Name | Character | Episodes |
|---|---|---|
| Lester Matthews | Sir Denis Nayland Smith | 14 |
| John George | Kolb | 14 |
| Clark Howat | Dr. John Petrie | 14 |
| Laurette Luez | Karamaneh | 14 |
| Carla Balenda | Betty Leonard | 14 |
| Steven Geray | 1 | |
| John Carradine | 1 | |
| Cedric Hardwicke | 1 | |
| Victor Sen Yung | 1 | |
| Leonard Strong | 1 |