Discovered copies of these old radio shows on the net for downloading. seems to have been an SF radio show from the 1950s in the USA. I found it interesting that there was a 1951 episode entitled "The Outer Limits" - was there a "Twilight Zone" episode as well?
There seem to be several sources for shows and details on the net:
Dimension XX Minus One (the sequel radio show)
I liked that many of the stories I'd read when young (like The Green Hills of Earth, Nightfall, There will come a soft Rain, and End as a World). You might have to sort out your CODECS and players to play these - see
The Codec Guide (Media Player Classic) and
VLC.