Dinty is a newsboy whose fight to care for his ailing mother leads him into conflicts with the other boys on the street and then with drug smugglers in Chinatown.
| Actor | Role |
|---|---|
 Wesley BarryDinty O'Sullivan | Dinty O'Sullivan |
 Noah BeeryWong Tai | Wong Tai |
 Colleen MooreDoreen O'Sullivan | Doreen O'Sullivan |
 Anna May WongHalf Moon | Half Moon |
 J. Barney SherryJudge Whitely | Judge Whitely |
 Marjorie DawRuth Whitely | Ruth Whitely |
| WWalter ChungSui Lung | Sui Lung |
 Tom GalleryDanny O'Sullivan | Danny O'Sullivan |
| NNewton HallThe Tough One | The Tough One |
| YYoung HippWong Tai's son | Wong Tai's son |
 Pat O'MalleyJack North | Jack North |
 Kate PriceMrs. O'Toole | Mrs. O'Toole |
| AAaron MitchellAlexander Horatius Jones | Alexander Horatius Jones |