Dimension X was first heard over NBC on April 8, 1950 and ran until September of 1951. Although not the first adult science fiction radio series, Dimension X is remembered because of the quality of the shows. Some of the writers whose works were dramatized were Ray Bradbury, Robert Block, Robert A. Heinlein, Isaac Asimov and Kurt Vonnegut. Many of the stories appeared in science fiction magazines such as Amazing, Astounding and Thrilling Wonder. These stories were adapted for radio by in-house scriptwriter George Lefferts.
The narrator was Norman Rose. It was one of the first shows to be recorded on tape. This was so new that one show, "Mars is Heaven", had to be re- successor, X Minus One.