The film follows Arthur Fleck, a mentally ill party clown and aspiring stand-up comedian living in a decaying Gotham City, as described in the Wikipedia entry for Joker (2019 film). As Arthur faces neglect, abuse, and personal tragedy, he spirals into moral nihilism and madness. His chaotic actions spark a violent countercultural revolution against the wealthy elite, paving the way for the emergence of the infamous Joker persona.
Joaquin Phoenix's performance as Arthur Fleck/Joker is a tour de force, earning him widespread critical acclaim and numerous awards, including the Academy Award for Best Actor. His portrayal is both heartbreaking and terrifying, capturing the character's vulnerability and menace. Joker Vegamovies