Arthur Fleck

Joker trailer: Joaquin Phoenix descends into super-villainy madness in a corrupt Gotham City

Joaquin Phoenix, who faces rejection in his career and gets mocked by people, slowly turns into a maniac in Joker

Joker director Todd Phillips shares six short clips from film, ahead of trailer release on 28 August

Todd Phillips, who also co-wrote the screenplay with Scott Silver, said the film's plot is more about how Joker becomes the man he came to be known as.