 When the movie was released in the UK, under the title "The Mysterious Invader", it was distributed by Anglo-Amalgamated.The British Board of Film Censors (BBFC) granted it an A-certificate on March 31, 1958.The A-certificate meant that the film was considered to be "more suitable for adults" than for children, but unlike many American films that were shown in Great Britain at the time, nothing was cut from it.