Cox played Sophie Aronnax in the 1997 film adaptation of Jules Verne's novel 20,000 Leagues Under the Sea.
Cox played Princess Irulan Corrino in Sci-Fi Channel's film adaptation of the Frank Herbert Dune novels. The movies were titled after the first and third novels, Dune and Children of Dune, respectively. Her part in the first movie was significantly expanded from the original literary character.
Julie Cox played Claudia Lear in the 2002 movie Kings of Texas, a re-telling of Shakespeare's King Lear in a western United States setting. Cox's character Claudia, represents Cordelia in Shakespeare's original text.
She is fluent in French.