It is rare to find a villain that is so fully defined solely by their opposition to a hero, but the Joker has turned what should be a flimsy premise into one of the strongest and most enduring double acts in comic book history.
Besides Alec Baldwin, Joaquin Phoenix is already on board to play the titular character in the film, which is expected to hit the screens in 2019.
Joaquin Phoenix has finalised a deal with Warner Bros to play The Joker in a new origin film from The Hangover director Todd Phillips.
Entertainment company Warner Brothers is reportedly trying to bring Oscar-winner Leonardo DiCaprio into the upcoming Joker origin movie.
Warner Bros and DC are in the initial stages of another Batman Universe spinoff movie, this one telling the origin story of the iconic villain The Joker.
The trailer for I am Heath Ledger debuted on 4 April, the day which would have marked his 38 birthday.