- Pearl White
- Pauline Marvin
- Crane Wilbur
- Harry Marvin
- Paul Panzer
- Raymond Owen - aka Koerner (re-release)
- Edward José
- Sanford Marvin - Pauline's Father
- Francis Carlyle
- Hicks - Owen's Henchman
- Clifford Bruce
- Gypsy Leader
- Donald MacKenzie
- Blinky Bill - the Pirate
- Jack Standing
- Ensign Summers
- Eleanor Woodruff
- Lucille Sampson / Mlle. de Leongeon [Ch. 18]
- Sam J. Ryan
- Baskinelli
- Louis J. Gasnier
- Louis J. Gasnier [Ch. 9]
- Milton Berle
- Boy
- George Daly
- Policeman Who Fights Gorilla [Ch. 19]
- Dick Dillon
- Man
- Chief Thunderbird
- Indian
