In the mid-1990s, screenwriter Stuart Hazeldine wrote a treatment titled "Alien: Earthbound". Fox executives were impressed by the script, having read it after "Alien Resurrection" had entered post-production. Joss Whedon had written an Earth-set script for "Alien 5", but Sigourney Weaver was not interested and wanted it to be set on the original planetoid. She has remained open to a role on the condition that she likes the story. Before 20th Century Fox greenlit "Alien vs. Predator", James Cameron had been collaborating on the plot for a fifth "Alien" film with another writer, but ceased work on learning of the crossover. Cameron stated that the crossover would "kill the validity of the franchise," and that "it was "Frankenstein Meets Werewolf"" – like "Universal just taking their assets and starting to play them off against each other." Although he liked the final product, he ruled out any future involvement with the series. In late 2008, Weaver hinted in an interview with MTV that she and Scott were working on an "Alien" spin-off film, which would focus on the chronicles of Ellen Ripley rather than on the Aliens, but the continuation of Ripley's story has not materialized.