Who played Ellen Ripley in 'Alien'?

Who played Indiana Jones? Who played Han Solo in the original 'Star Wars' trilogy? Who played Luke Skywalker in the original 'Star Wars' trilogy? Who played Princess Leia in the original 'Star Wars' trilogy? Who played Sarah Connor in 'The Terminator'? Who played Jack Torrance in 'The Shining'? Who played the Joker in 'The Dark Knight' (2008)? Who played the Joker in Tim Burton's 'Batman' (1989)?