Science fiction was well-represented as well, especially by Dimension X and later by X Minus One.
Dimension X ran from 1950 to 1951, adapting stories from Astounding Science Fiction magazine. In 1956, the same producers and writers revived the show as X Minus One, still doing adaptations of stories by some of the best science fiction authors active at that time. One of the things that made these shows so good was that they never wrote down to their audience. If the show dealt with a difficult concept, it still expected the listeners to be bright enough to follow along. Also, they adapted the stories very faithfully, usually making only those changes necessary to make it work dramatically on radio. They did a lot of Ray Bradbury stories, but also did Asimov, Heinlein, Jack Vance and others.