The Dark Knight did not feature Ledger as the Joker.
 Detective Comics #168 (1951) introduced the Joker's first origin story as the former Red Hood: a masked criminal who, during his final heist, vanished after leaping into a vat of chemicals to escape Batman
 A redesigned Joker, voiced by Kevin Michael Richardson, appeared in 2004's The Batman; Richardson was the first African-American to play the character

