Who played the Joker in 'The Dark Knight' (2008)?

Who played Princess Leia in the original 'Star Wars' trilogy? Who played Ellen Ripley in 'Alien'? Who played Sarah Connor in 'The Terminator'? Who played Jack Torrance in 'The Shining'? Who played the Joker in Tim Burton's 'Batman' (1989)? Who played the title role in 'Joker' (2019)? Who played Batman in 'The Dark Knight' (2008)? Who played Batman in Tim Burton's 'Batman' (1989)?