The Beast Within: The Making of Alien (2003 Documentary) H.R. Giger, Ridley Scott, Sigourney Weaver

This documentary treats horror and science fiction film fans to a behind-the-scenes look at the making of Alien, the terrifying classic about a spaceship crew trapped with a hideous monster that's hunting them one by one. Features interviews with director Ridley Scott and master designer H.R. Giger, as well as with star Sigourney Weaver and other members of the cast and crew, who share their experiences from working on the project and discuss the special efforts that went into bringing it all together.
https://www.imdb.com/title/tt0387056/