mysterious traveler if you believe ep 84

A horror story about a man-made blob of protoplasm that turns into a monster!
About The Mysterious Traveler:
Written and directed by Robert Arthur and David Kogan, the radio series was sponsored by Adam Hats. It began on the Mutual Broadcasting System, December 5, 1943, continuing in many different time slots until September 16, 1952.
Stories ran the gamut from fantasy and science fiction to straight crime dramas of mystery and suspense. The lonely sound of a distant locomotive heralded the arrival of the sinister narrator (portrayed by Maurice Tarplin), who introduced himself each week in the following manner:
“This is the Mysterious Traveler, inviting you to join me on another journey into the strange and terrifying. I hope you will enjoy the trip, that it will thrill you a little and chill you a little. So settle back, get a good grip on your nerves and be comfortable-if you can!”
Only 75 of the original 370 Mysterious Traveler episodes still exist. The popularity of the series spawned other supernatural shows, such as The Sealed Book. With scripts by a Mysterious Traveler writer and Tarplin as host-narrator, The Strange Dr. Weird was a nearly identical program.
(Wikipedia)