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