Captain Donald King is sent to India to carry out a secret mission while the Black Watch, his regiment, leaves for France at the outbreak of the First World War.
| Actor | Role |
|---|---|
 Victor McLaglenCaptain Donald King | Captain Donald King |
 Myrna LoyYasmani | Yasmani |
 David TorrenceField Marshal | Field Marshal |
 David RollinsLieutenant Malcolm King | Lieutenant Malcolm King |
 Cyril ChadwickMajor Twynes | Major Twynes |
 Lumsden HareBlack Watch Colonel | Black Watch Colonel |
 Roy D'ArcyRewa Ghunga | Rewa Ghunga |
| DDavid PercyDavid | David |
 Mitchell LewisMajor Mohammed Khan | Major Mohammed Khan |
 Claude KingGeneral | General |
 Walter LongHarrim Bey | Harrim Bey |
 Francis FordMacGregor (uncredited) | MacGregor (uncredited) |
 Randolph ScottBlack Watch Soldier (uncredited) | Black Watch Soldier (uncredited) |
 John WayneBlack Watch Soldier (uncredited) | Black Watch Soldier (uncredited) |