I'm looking for the name of a radio broadcast.?

Question

Its a story where a town in the 50s experiences power failures. First its all mechanical things, then its certain houses, then others. The switching on and off causes people to suspect each other and eventually they turn on each other. At the end you find out that it is aliens controling the power from a spaceship, destroying planets without having to fight anyone.

Answer 1

Out of Space Zapper