[2] It was shown as early as May 2, 1975 in Houston, Texas[1] and became a huge box office success grossing $15 million at the box office [3] largely due to its successful promotional campaign with TV spots and posters.
To cash in on the success of Beyond The Door, Film Ventures International purchased the U.S. release rights to Mario Bava's Italian horror film Shock and retitled it as Beyond The Door II due to it being Italian and having a similar theme of possession.
Scripted by Sheila Goldberg and directed by Jeff Kwitny, the film was shot in Serbia under the title "The Train".
Ovidio G. Assonitis acted as producer on the film and financed it through his company Trihoof Investments.
Although only retitled in the U.S., all modern Blu-rays carry the title Beyond the Door III on the prints, including the Region 1 DVD by Shriek Show.
The 2-disc DVD set was released on 16 September 2008 and featured both the international cut (running 109 minutes) displaying the title card The Devil Within Her and the abridged U.S. theatrical cut (running 97 minutes) displaying the title card Beyond the Door.
[12] The second disc also includes Italy Possessed, a newly commissioned feature-length documentary on Italian exorcism films.
Beyond the Door III was released on Region 1 DVD by Media-Blasters sublabel Shriek Show.