15 episode serial where Jack Armstrong, the All-American Boy, battles the evil Dr. Grood, who has placed a death ray aboard his spaceship orbiting Earth.
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
