- Richard Bailey
- Lance Reardon
- Linda Stirling
- Claire Forrest
- Roy Barcroft
- Capt. Mephisto
- Kenne Duncan
- Sidney Brand
- Forrest Taylor
- William Forrest
- Forbes Murray
- Harry Hargraves
- Jack Ingram
- Edward Armstrong [Chs. 1-11]
- Harry Strang
- Fred Braley
- Ed Cassidy
- Paul Melton [Chs. 1-6, 10]
- Frank Alten
- John Raymond
- Lane Chandler
- Police Insp. Reed [Chs. 1, 8]
- Russ Vincent
- Ruga
- Dale Van Sickel
- Barker / Ritter / Lewis / Frazier / Sardon [Chs. 1, 3-4, 7-10]
- Tom Steele
- Lyons - Thug / Bailey [Chs. 3-4, 10, 13]
- Duke Green
- Spencer Harvey [Ch. 1] / Thug Clark in Wine Cellar [Ch. 5]
- Fred Graham
- Blake - Thug B-6 in Winery [Ch. 4]
- Fred Howard
- C.D. Pembroke [Ch. 7]
- Si Jenks
- Joe Benson [Ch. 3]
- Eddie Parker
- Ship's Captain [Chs. 1, 8] / Fallon - Cave Thug [Ch. 12] (uncredited)
- Duke Taylor
- Hill - Thug [Ch. 8]
