 Kermit MaynardMountie Sergeant Mack MacKenzie | Mountie Sergeant Mack MacKenzie |
 Eleanor HuntBeth Braden | Beth Braden |
 Russell HoptonDuke Milford | Duke Milford |
 J. Farrell MacDonaldInspector | Inspector |
 LeRoy MasonStone | Stone |
 Gertrude AstorMae | Mae |
 Ben Hendricks Jr.Sam Keene | Sam Keene |
 Walter BrennanStuttering Cook | Stuttering Cook |
 Lloyd IngrahamProf. Braden | Prof. Braden |
 Nelson McDowellTope | Tope |
 Lafe McKeeOld Trapper | Old Trapper |
| CChris Willow BirdIndian Henchman (uncredited) | Indian Henchman (uncredited) |
| JJack ChisholmHenchman Durkin (uncredited) | Henchman Durkin (uncredited) |
 Kernan CrippsMike - the Bartender (uncredited) | Mike - the Bartender (uncredited) |
 Dick CurtisHenchman Pete (uncredited) | Henchman Pete (uncredited) |
 Henry HallOld Trapper #2 (uncredited) | Old Trapper #2 (uncredited) |
 Charles KingMountie Wallace (uncredited) | Mountie Wallace (uncredited) |
 Artie OrtegoHenchman Gareau (uncredited) | Henchman Gareau (uncredited) |
 Tyrone PowerMountie (uncredited) | Mountie (uncredited) |
| RRockyMack's Horse (uncredited) | Mack's Horse (uncredited) |