X Minus One was a science fiction radio series on NBC from April 1955 through January 1958. The show featured stories written by some of the big names in 1950s science fiction, like Ray Bradbury, Robert Heinlein, and Issac Asimov. X Minus One followed another great sci-fi series called Dimension X that was broadcast in 1950-51. Some of the X-1 shows were rebroadcasts of Dim X. For baby boomers that liked The Outer Limits and The Twilight Zone and for all you Trekkies, X Minus One is the forefather of the science fiction you grew up with.