Sigourney Weaver is an American actress. She is known especially for her role of Ellen Ripley in the four Alien films: Alien, Aliens, Alien 3, and Alien Resurrection. Other notable roles include Dana Barrett in Ghostbusters and its sequel Ghostbusters II, Gorillas in the Mist: The Story of Dian Fossey, Working Girl, The Ice Storm, Galaxy Quest, Prayers for Bobby and Grace Augustine in Avatar. Weaver has been nominated for three Academy Awards, three BAFTA Awards, two Emmy Awards, six Saturn Awards and seven Golden Globe Awards, winning two in 1988 for Gorillas in the Mist and Working Girl.