Which actor portrayed the Joker in "The Dark Knight"?

Heath Ledger

How many men did Gideon finally use to defeat Midian? Who hosts the late-night comedy show 'The Late Late Show' featuring 'Carpool Karaoke'? In Chinese tradition, what festival marks the coming of winter? Which European explorer journeyed to China and served in Kublai Khan's court in the 13th century? What form does Mystique usually reveal her true self as?