Arthur Fleck, now incarcerated at Arkham State Hospital, who encounters Harleen Quinzel, a fellow patient who becomes dangerously obsessed with his Joker persona. Their shared psychosis fuels a destructive and increasingly chaotic relationship, blurring the lines between reality and fantasy. The film delves deeper into Arthur's mental state, exploring the complexities of his condition and the enduring power of his iconic villainous persona.
