Jack Armstrong (1947)
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- John Hart — Jack Armstrong
- Rosemary La Planche — Betty Fairfield
- Claire James — Princess Alura [Chs. 3-6, 9-11, 15]
- Joe Brown Jr. — Billy Fairfield (as Joe Brown)
- Pierre Watkin — Uncle Jim Fairfield
- Wheeler Oakman — Prof. Hobart Zorn
- Jack Ingram — Henchman Blair
- Eddie Parker — Henchman Slade
- Hugh Prosser — Vic Hardy