Before filming started, author H.G. Wells told everyone connected with the film how much he'd hated Fritz Lang's film Metropolis (1927) and how he wanted them to do the opposite of what Lang (whom he called "Lange") and his crew had done.
The date on the newspaper in the scene in which the war ends is September 21, 1966, which would have been the 100th birthday of H.G. Wells.
At the time of its 1947 U.S. re-release, the film was most frequently shown on the top half of a double bill, with The Man Who Could Work Miracles (1936), which likewise was based on a novel by H.G. Wells and starred Ralph Richardson on the lower half of the program.
Film historians consider this to be one of Great Britain's first major science-fiction films.
Ralph Richardson stated that he intentionally modelled his character, the despotic boss of Everytown, after Italian fascist dictator Benito Mussolini.
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