On this day in 1940, Superman appeared on a radio station (a Mutual Radio station WOR in New York City) for the first time, the first time in a non-print medium. It was the debut of the radio show called The Adventures of Superman and the episode was called The Baby From Krypton.
We don’t get to hear Superman speak though until the second episode: Clark Kent, Reporter (February 14, 1940.)
The Haus of Dcaligari 