Behind the Scenes of 'The Dark Knight'

Holy casting call, Batman! "Extra" has uncovered the top five secrets behind the global movie phenomenon "The Dark Knight" -- from the flick's own cast members. Click here to find out what famous actors were almost chosen over Heath Ledger to play the Joker! See also: 'Dark Knight' Premieres in Gotham Caine: Heath Will Get Oscar Nod Ledger Was 'Pure Joy' Click on an image to view the HEATH LEDGER photo gallery! (link)