Jack Armstrong (1947) is a Columbia film serial, based on the radio adventure series Jack Armstrong, the All-American Boy. Plot Vic Hardy, a scientist working for Jim Fairfield's aviation company, is kidnapped by Jason Grood's gang after discovering radiation emitting from their secret island base. Grood intends to conquer the world and forces Hardy to assist him. Fairfield, along with his niece and nephew and, most importantly, the hero of the title, attempt to rescue Hardy and stop Grood's plans. They are assisted by the native tribe living on the island, led by Princess Alura. Cast John Hart as Jack Armstrong Rosemary LaPlanche 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 Chapter titles Mystery of the Cosmic Ray The Far World Island of Deception Into the Chasm The Space Ship Tunnels of Treachery Cavern of Chance The Secret Room Human Targets Battle of the Warriors Cosmic Annihilator The Grotto of Greed Wheels of Fate Journey into Space Retribution Source: See also List of film serials by year List of film serials by studio References External links Review of the VCI DVD at FulvueDrive-in.com 1947 films 1940s English-language films American black-and-white films 1947 adventure films Columbia Pictures film serials Films based on radio series Films directed by Wallace Fox American adventure films Films with screenplays by George H. Plympton 1940s American films