Little Orphan Annie was adapted to a 15-minute radio show that debuted on WGN Chicago in 1930 and went national on NBC's Blue
Network beginning April 6, 1931. The show was one of the first comic strips adapted to radio, attracted about 6 million fans, and left the air in 1942. Radio
historian Jim Harmon attributes the show's popularity in The Great Radio Heroes to the fact that it was the only radio show to deal with and appeal to young children.