To save costs, the production used many sets and props from the Amicus movie Les Daleks envahissent la Terre (1966) filmed earlier.
Released on a double bill with The Terrornauts (1967). Director Freddie Francis claimed that the company had spent all their budget on that film, leaving nothing left for They Came from Beyond Space (1967). The double feature failed at the box office and has been described as "the two worst films the company ever produced".
In the laboratory where they cast the silver cage stands a big clear plastic (or glass) gun. This is the same prop used as the main device in Le Rayon de la mort (1966).
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