Sigourney Weaver (born Susan Alexandra Weaver; October 8, 1949) is an American actress who protrayed Ellen Ripley, the main heroine of the first three Alien films making her debut appearance in the film Alien. She later protrayed Ripley 8 in Alien: Resurrection (film). Sigourney is the daughter of Elizabeth Inglis who also protrayed Amanda Ripley in Aliens .
In 2003 Sigourney's signature role Ellen Ripley was selected by the American Film Institute as the 8th greatest hero in American cinema history.
Weaver has appeared in numerous other films including Be Kind Rewind (2008, with Danny Glover) and Avatar (2009, written and directed by James Cameron). In 2011, Weaver portrayed the role of "The Big Guy" in the sci-fi comedy "Paul". This was because she always wanted to be in a film that was quote "A love letter to sci-fi fans. I jumped at the chance to be in it. To find a comedy that also pays homage to sci-fi is a dream come true."