Jack Armstrong 1947

Synopsis:

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.

Directed by: Wallace Fox
Written by: Royal K. Cole & Leslie Swabacker & Arthur Hoerl & Lewis Clay
Runtime: 300 minutes
Tagline: RADIO'S ALL-AMERICAN BOY LEAPS INTO AN ALL-THRILL, ALL-TIME HIGH IN SERIAL ADVENTURE!
Cast:
John Hart
John Hart
Jack Armstrong 
Rosemary La Planche
Rosemary La Planche
Betty Fairfield 
Claire James
Claire James
Princess Alura [Chs. 3-6, 9-11, 15] 
Joe Brown Jr.
Joe Brown Jr.
Billy Fairfield (as Joe Brown) 
Pierre Watkin
Pierre Watkin
Uncle Jim Fairfield 
Wheeler Oakman
Wheeler Oakman
Prof. Hobart Zorn