Filmmaker James Cameron has spoken candidly for the first time about his involvement on Alien 5 – a potential sequel to the Alien series that still seemed like a possibility last spring

Both Ridley Scott, who created the first Alien, and Cameron, responsible for the second, had expressed interest in continuing the series. So what went wrong? In an interview with AICN , Cameron explains that it was 20th Century Fox's bright idea for an Alien-Predator crossover film that soured his interest in making Alien 5 . In fact, he abandoned the work he'd already begun on it when he heard about AVP."Ridley [Scott] and I talked about doing another Alien film, and I said to 20th Century Fox that I would develop a 5th Alien film. I started working on a story, I was working with another writer and Fox came back to me and said, 'We've got this really good script for Alien vs Predator,' and I got pretty upset. I said, 'You do that you're going to kill the validity of the franchise in my mind,' because to me, that was Frankenstein Meets Werewolf. It was Universal just taking their assets and starting to play them off against each other."So, I stopped work. Then I saw Alien vs Predator and it was actually pretty good. (laughs) I think of the 5 [sic] Alien films, I'd rate it 3rd."Unfortunately, Cameron's positive opinion of AVP hasn't changed his mind. He says he sees now that Alien is Fox's "asset", not his. Putting up with another studio's ideas of how to steer a franchise is something Cameron has grown tired of.In the meantime, Cameron has other projects like Project 880/Avatar on the go — which he promised to reveal more about soon. For now, however: no more Alien movies.