He plays the bizarrely goofy titular character, Arthur Fleck, who is a complicated man that showcases a wide range of emotions. After all, he is known for an iconic laugh that comes about as a compulsion during moments that are anything but funny.

This story includes details about the ending of "Joker: Folie à Deux' The murder trial at the center of "Joker: Folie à Deux" ends in explosive fashion: A bomb goes off and destroys the courtroom after Arthur Fleck (Joaquin Phoenix) decides to defend himself and confesses that the Joker is not some split personality of his.

Folie à Deux." There are a lot of controversial elements to the long-awaited sequel to "Joker," but maybe the biggest one is the reveal that Joaquin Phoenix's Arthur Fleck isn't really the Joker we all know and love.