Jack Armstrong, the All-American Boy was a radio adventure series which maintained its popularity from 1933 to 1951. The program originated at WBBM in Chicago on July 31, 1933, and was later carried on CBS, then NBC and finally ABC. It was created by General Mills, a pioneer in the development of unique and compelling advertising under the stewardship of Vice-president of Advertising, Samuel Chester Gale. Gale later served as President of the Ad Council. Intending to promote breakfast cereal Wheaties, Gale developed the character of Jack Armstrong as a fictitious "everyboy" whom listeners would emulate: If Jack ate Wheaties, boys across the nation would, too. Early popularity led to commissioning of a radio serial broadcast.
There was a real Jack Armstrong, a member of Sam Gale's college fraternity, Phi Sigma Kappa at the University of Minnesota. Gale was impressed by both the red-blooded name and the "wholesome nature" of the young man so he incorporated it as the name of his new invented spokesman. Another creation of Sam Gale's fertile mind was the iconic Betty Crocker.
The storylines centered around the globe-trotting adventures of Armstrong (played by Jim Ameche until 1938 and later portrayed by Michael Rye), a popular athlete at Hudson High School, his friends Billy Fairfield and Billy's sister Betty, and their Uncle Jim, James Fairfield, an industrialist. Frequently, Uncle Jim Fairfield would have to visit an exotic part of the world in connection with his business, and he would take Jack Armstrong and the Fairfield siblings along with him. The show was created by writer Robert Hardy Andrews. Sponsored throughout its long run by Wheaties, the program was renamed Armstrong of the SBI when Jack graduated from high school and became a government agent in the final season, when it shifted from a 15-minute serial to a half-hour complete story format. (Source: wikipedia.org)