You may have heard this before, but before there was HDTV, there was just regular TV, kind of pixilated. Before there was cable and satellite TV, there was just regular broadcast TV, received -- for free -- via an antenna. Before there were remote controls, people had to get up to change the channels (all 13 of them). Before there was color, there was black-and-white. And before all that, there was no picture at all... just sound. And they called it radio.
People used to listen to all kinds of things on the radio: talk shows, music shows, comedy shows, adventure shows. Sometimes actors stepped up to the mike to re-create famous movies for radio. Sometimes comic books, comic strips and pulp novels were adapted into radio. Some of the most famous radio shows were 'Little Orphan Annie,' 'The Cisco Kid,' 'Fibber McGee and Molly,' 'Dick Tracy,' 'Flash Gordon,' 'The Lone Ranger,' 'The Shadow,' 'War of the Worlds,' 'You Bet Your Life' and 'The Green Hornet.' That last was actually created for the radio, and only later evolved into a comic book, TV show, and the new Michel Gondry film that opens this week.