Thundergate on AllMovie

Owen Moore has an unlikely dual role in this melodrama. Robert Wells (Moore) is an American born in China who, unbeknownst to him, has an Oriental half-brother (also Moore). Wells' uncle sends him to help Ray Williams (Robert McKim) 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 (Tully Marshall). Kong Sue has run off with some money, and he changes clothes with lookalike Wells so he can more effectively disappear. So Wells wakes up to find himself the son of the Lord of Thundergate. He is finally able to expose Williams and his nefarious plot and, along the way, meets Ellen Ainsmith (Virginia Brown Faire), a white girl who has been raised as a Chinese. He saves her from a forced marriage to the Lord of Thundergate, wins her heart and recovers from his addiction.