Henry Beam Piper was an American science fiction writer. He wrote many short stories and several novels. He is best known for his extensive Terro-Human Future History series of stories and a shorter series of "Paratime" alternate history tales.

Dimension X was an NBC radio program broadcast mostly on an unsponsored, sustaining basis from April 8, 1950, to September 29, 1951. The first 13 episodes were broadcast live, and the remainder were prerecorded. Fred Wiehe and Edward King were the directors, and Norman Rose was heard as both announcer and narrator, opening the show with: "Adventures in time and space... told [or transcribed] in future tense..." For two months, beginning on July 7, 1950, the series was sponsored by Wheaties.