There are reasons why the (literally) visceral impact of "Alien" continues to resonate four decades after it's release, and this revelatory examination of the horror/sci-fi staple's creation from documentarian Alexandre Philippe ("The People vs. George Lucas") looks at the inspirations of screenwriter Dan O'Bannon through the perspectives of film and art critics, and how Ridley Scott and H.R. Giger brought them before the camera; plus insights from Veronica Cartwright, Tom Skerritt, more. 95 min. Widescreen; Soundtrack: English.