While the specifics of the character have not been revealed, The Hollywood Reporter describes the Taxi Driver actor's part as "instrumental" to the villain's origins.
Plot details remain thin on the ground, but rumour has it the movie will take place in the fictional Gotham City during the 80s.
The Hangover director Todd Phillips, who co-wrote the screenplay with Scott Silver and is helming the movie, called the comic-book adaptation an “exploration of a man disregarded by society [that] is not only a gritty character study, but also a broader cautionary tale.”
Joker has a budget of $55 million, significantly less than Warner Bros. tent-pole comic-book movies: the lowest budget recent DC movie has been Wonder Woman, at $149 million, while the highest was Justice League at $300 million.
Production begins later this year, the tone of the movie being much more experimental and darker than recent DC movies. Joker will likely not be connected to Suicide Squad, which featured Jared Leto as the iconic character.
The Warner Bros. and Village Roadshow production reaches cinemas 4 October 2019.
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