Sigourney Weaver, 75, played Ellen Ripley in the original 1979 blockbuster and went on to appear in three subsequent movies.
While Weaver was not involved in the new television spin-off, she has admitted she's too terrified to watch the Disney Plus series without her husband Jim Simpson by her side.
"I'm watching it like a real person," Weaver told Collider.
"I have to make a date with my husband because I don't want to see it by myself in case one of those things comes out of the screen.
"So we have to set it up. So I'm behind seeing it, but the ones I've seen are fascinating."
The show - created by Noah Hawley and starring Sydney Chandler, Alex Lawther and Essie Davis - is set in 2120, which is two years prior to the events of Weaver's first film.
She said she was impressed by the series so far.
"I admire Noah's work - Fargo - and I was curious to see what he would do with this world," she said.
"And what I admire about it is: it's not alien-centric.
"It is about what world we will be living in in 100 years. I think the scope of it is so much bigger than an Alien project ...
"(It's) much more about our world, what's going to be happening to it, what's going to be important, the role of greed.
"It's just exploded some of the themes that have always been part of the Alien series, and I think it's beautifully cast and beautifully done. I can't believe it's television, frankly."
Weaver previously claimed the idea of taking the space-set story to earth would be "boring" after holding talks with studio heads about the best way to continue the Alien franchise before Sir Ridley Scott released the prequel movies Prometheus and Alien: Covenant in 2012 and 2017 respectively.
"Fox and I disagreed on how the franchise should continue," she told The Independent newspaper.
"But I'm glad it's Ridley doing it, and I'll be as curious as anyone, or maybe more curious, to see it.
"I think he took my suggestion. Fox wanted to go to earth and I said: 'That's so boring. Who wants to see aliens on earth?' I said: 'Go back to the planet'."