It is based on the eponymous 1952 novel by Raymond F. Jones, which was originally published in the magazine Thrilling Wonder Stories as three related novelettes: “The Alien Machine” in the June 1949 issue, “The Shroud of Secrecy” in December 1949, and “The Greater Conflict” in February 1950. The film was released in 1955 as a double feature with Abbott and Costello Meet the Mummy.
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