Adventures of Superman is a radio show which aired between 1938 and 1951 on Mutual and ABC with Kelloggs as a sponsor. While being aired on Mutual it was a 15 minute show but was increased to a half hour after moving to ABC.
“Faster than a speeding bullet. More powerful than a locomotive. Able to leap tall buildings in a single bound.’
Look! Up in the sky!
It’s a bird!
It’s a plane!
Link: The Adventures Of Superman:WikiPedia