IMDb:
"Justine" is the re-edited (by Joe D'Amato)1979 re-issue of Jess Franco's apparently never-released 1975 film "De Sade's Juliette". D'Amato gutted about half of Jess' original footage and replaced it with scenes from Franco's films "Midnight Party" and "Shining Sex" and re-dubbed the entire film with new dialog. Why he tampered with Franco's first true hardcore (XXX) film is anybody's guess, but fortunately the end result is still quite good, which is testimony to Franco's talents more than D'Amato's, although D'Amato's adding of the Nico Fidenco soundtrack to the film (replacing the Daniel White original) gives the film an edgy element that other Franco films lack. This film, besides being confused with Franco's 1968 film "Justine" (the one with Romina Power), has apparently been confused here with Claude Pierson's 1975 "Justine De Sade", which stars Alice Arno and is a totally different film in which Franco had no involvement. To further insult Franco and Lina Romay, Alice Arno is given star billing in Franco's "Justine" (the re-edited version), despite the fact that she is not even in the film, and Lina Romay is downgraded to supporting billing, despite the fact that the entire film revolves around her and she is in virtually every scene. Again, this appears to be a total slap in the face to this creative duo -- perhaps the producers were unhappy with Jess and Lina's intent to film a truly interesting adult film as opposed to a frothy one.