The first shows were duplicated from the original Dimension X. Later, the producers pulled ideas for shows from the pages of "Galaxy Magazine." Like Dimension X, X-Minus One used some of the leading science fiction authors in the genre, including Isaac Asimov, Ray Bradbury, Philip K. Dick, Robert A. Heinlein, Frederik (Fred) Pohl and Theodore Sturgeon, Robert Sheckley, J. T. McIntosh, Fritz Leiber, and many more.
The show's script writers, Ernest Kinoy and George Lefferts, made some remarkable original scripts. Leffert's "The Parade" features a Martian who hires an advertising agency to help him plan a parade to celebrate the Martian invasion. Some shows ended unhappily, such as "The Cold Equation" and an adaptation of Ray Bradbury's "Mars in Heaven", where earthmen land on Mars to discover it's inhabited by people they know. Remarkably, all episodes of X-Minus One survive.