Actress Sigourney Weaver said she was not even sure if she wanted to be in a movie when she first auditioned for Alien.

The 67-year-old actress came from a theatre background and said she wasn't sure if she wanted to sign up to a Hollywood movie when she stood in front of the science fiction franchise's director Ridley Scott at her audition for the 1979 film, reported People magazine.

"I remember that (director) Ridley (Scott) built an entire set for me just for the audition. I was from the theatre. I wasn't even sure I wanted to be in a movie! 

"I think I was the only person they tested. What was so helpful to me is that we did a run-through of several scenes.

Ridley went out of his way to make sure that I had a very real world in which to be," Sigourney said.