The Adventures of Superman was a long running radio serial adapted from
the DC Comics character that originally aired from 1940 to 1951. It began as
a syndicated show on New York City’s WOR. The Serial went to the Mutual
network from August 31, 1942, to February 4, 1949 as a 15-minute show,
usually running three or five times a week. Superman was picked up by
the ABC radio network in October of 1949, returning to afternoon air
time twice a week until March 1, 1951. Bud Collyer played the title
role with Joan Alexander playing Lois Lane, both pictured below.

Bud Collyer played Superman/Clark Kent 

Joan Alexander was Lois Lane

That well known signature opening of Superman, one
of the most famous in radio history, was delivered by
Jackson Beck (above), the announcer-narrator of the
show from 1943 to 1950.
 

First Superman comic