One reason Fox execs are so thrilled with Lindelof’s Alien draft is that, not only is it creatively engaging, but it adds no expensive “set pieces” — production-speak for elaborate, effects-heavy action sequences that add millions to the cost of a film — to the movie. 20th Century Fox and Scott have been wrangling over the director’s proposed budget. One insider familiar with the situation puts Scott’s suggested budget at between $150 million and $160 million; Fox obviously, would like that number to shrink. Still, this is some good news for Fox, which has almost nothing resembling a blockbuster in the hopper for the summer of 2012, and could certainly stand to reinvigorate a wildly popular multi-part sci-fi franchise.

A parade of actresses have met with Scott (who’s being represented in these negotiations by his longtime WME agent George Freeman) to discuss the lead role — that of a female Colonial Marine general — but only two have engendered substantial enthusiasm from both Fox brass and Ridley Scott Associates, the director’s Fox-based production company: Vulture can report exclusively that at the top of the list is Natalie Portman. Right behind Portman is the already-reported Noomi Rapace, star of David Fincher’s The Girl With The Dragon Tattoo.

Don’t take Scott’s recent interview with The Independent — in which he claims that the Alien prequel would be “will be really tough, really nasty” — to mean this is automatically going to be an R picture: We’re told another reason Fox execs are pleased with Lindelof’s re-write of original screenwriter Jon Spaihts’ script is that it’s still aimed at a more accessible PG-13 rating. “The thinking,” explains one insider, “is that if the original Alien were released today, minus the F-bombs, you could still get a PG-13. Alien is a very Jaws-ian movie: There’s no sex, and while there’s lots of violence, most of it is off-camera. Maybe you’d have to cut away from certain scenes two seconds earlier, but it could be done.”

….It’s not in anyway a reboot of Alien or the Aliens franchise; it’s really meant to be viewed as Scott’s second Alien movie. What’s more, no Predator creatures appear anywhere within the film. Despite Fox’s efforts to mate the two sci-fi icons (sci-ficons?), Scott’s camp sees the two franchises as hailing from distinct genres that will not co-mingle, synergy be damned. “The later Aliens movies were action movies, but the original Alien was a horror-suspense film,” explains one spy, “This returns the franchise to its roots.”