The 1950's saw both the twilight of the Golden Age of Radio and the
birth of the science fiction radio series. Science fiction was not
new to radio before 1950, but it was either targeted to juvenile
audiences or were SF shows in a broader series, for example, ESCAPE:
"The Time Machine". On March 15, 1950, the first show of Mutual's
2000 PLUS aired, becoming the very first true science fiction series
in the US.
BEYOND TOMORROW was to be CBS's science fiction series.
and one audition were transcribed to disk, but it's not certain if
they were actually broadcast, despite announcements in newspapers.
In the audition, the series title was BEYOND THIS WORLD and the
audition show was "The Outer Limit". The first show under the
series name BEYOND TOMORROW was "Requiem", a story by Robert
Heinlein, which was later be done in DIMENSION X. The last show,
which was the same as the audition, "The Outer Limit", may be the
most often used science fiction story in radio. It was also heard
in ESCAPE (Feb 7, 1950), DIMENSION X (Apr 8, 1950 and Sep 8, 1950),
SUSPENSE (Feb 15, 1954) and X MINUS ONE (Nov 16, 1955).