 When daytime serials began in the early 1930s, they became known as soap operas because many were sponsored by soap products and detergents.The line-up of late afternoon adventure serials included "Bobby Benson and the B-Bar-B Riders", "The Cisco Kid", "Jack Armstrong, the All-American Boy", "Captain Midnight", and "The Tom Mix Ralston Straight Shooters".Badges, rings, decoding devices and other radio premiums offered on these adventure shows were often allied with a sponsor's product, requiring the young listeners to mail in a boxtop from a breakfast cereal or other proof of purchase.