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The working title of this film was The Man Who Saved the Earth. The film opens with footage of an A-bomb test, accompanied by voice-over narration. The title card appears briefly, superimposed over the bomb footage. The remaining credits appear at the end of the film, beginning with W. Lee Wilder's producing and directing credit. Mack V. Wright is credited onscreen as production supervisor, but in the Hollywood Reporter production chart as assistant director. It has not been determined whether he worked in both capacities. The Hollywood Reporter chart also incorrectly listed actress Barbara Bestar as Barbara Starr. Modern sources note that scenes featuring the aliens' cavern hideout were shot in Bronson Canyon in Los Angeles.