Obsada:

• Milburn Stone Jim Hudson
• Marjorie Weaver Ruth Miller
• Edgar Kennedy Bosun Higgins
• Samuel S. Hinds Herman Brock [Chs. 3-13]
• Martin Kosleck Dr. Hauss
• Ralph Morgan Dr. Miller
• Joseph Crehan Bill Hudson [Chs. 3-13]
• Fuzzy Knight 'Grit' Hartman [Chs. 4-13]
• Harry Cording Capt. Greeder [Chs. 1-3]
• Anthony Warde Brandon [Chs. 3-13]
• Jack Clifford posing as trapper [Ch. 1] Agent Dunn
• William Ruhl posing as trapper [Chs. 1-2] Agent Grey
• Perc Launders phoney marshal [Ch.4] Haegle
• Edward Gargan Kurtz [Chs. 4-13]
• Jay Novello Eskimo Chief [Ch. 2-4]
• Tom Keene Burger [Ch. 11]
• George Chesebro Brandon's Henchman
• Edmund Cobb Miner Worker Preparing Ambush [Ch. 9]
• Kernan Cripps The Marshal [Ch. 6]
• Reed Howes Ship's Officer [Ch. 1]
• Jack Ingram Henchman
• Stanley Price Brandon's Henchmen
• Jack Rockwell Kessel - Mine Thug [Chs. 6-7 - 12-13]
• Ben Taggart Deputy Marshal [Ch. 7]