Sigourney Weaver

Susan Alexandra "Sigourney" Weaver is an American actress and film producer. Following her film debut as a minor character in Annie Hall , she quickly came to prominence in 1979 with her first lead role as Ellen Ripley in Alien. She reprised the role in three sequels: Aliens , for which she was nominated for the Academy Award Best Actress; Alien 3 , and Alien: Resurrection . She is also known for her starring roles in the box-office hits Ghostbusters , Ghostbusters II , and Avatar .