Robert Wells is an American born in China who, unbeknownst to him, has an Oriental half-brother. Wells' uncle sends him to help Ray Williams build bridges in China. Williams is in league with Chinese reactionaries and he discredits Wells by turning him into a drug addict. Wells eventually becomes an outcast and is in a stupor when he is found by his half-brother, Kong Sue, the son of the Lord of Thundergate, a powerful Mandarin reactionary.
| Actor | Role |
|---|---|
 Owen MooreRobert Wells / Kong Sur | Robert Wells / Kong Sur |
 Virginia Brown FaireEllen Ainsmith / Jen Jue | Ellen Ainsmith / Jen Jue |
 Edwin B. TiltonJames Sanderson (as Edwin Booth Tilton) | James Sanderson (as Edwin Booth Tilton) |
 Sylvia BreamerAlberta Hayward | Alberta Hayward |
 Robert McKimRay Williams | Ray Williams |
| RRichard CummingsJim Davis | Jim Davis |
| WW.E. DyerMike | Mike |
 Tully MarshallSuen Tung | Suen Tung |
 Tote Du CrowYuen Kai | Yuen Kai |
 Ynez SeaburyMey Wang | Mey Wang |
 Willie FungMinor Role (uncredited) | Minor Role (uncredited) |
 Bernard SiegelMinor Role (uncredited) | Minor Role (uncredited) |