Joker (Batman)
Jack Nicholson plays the menacing Joker in Tim Burton's 1989 film Batman, serving as the main antagonist. Introduced as Jack Napier, a ruthless mob boss, the character undergoes a traumatic transformation involving exposure to chemicals, leading to his iconic appearance. Throughout the film, the Joker is defined by his maniacal laughter, unpredictable behavior, and relentless pursuit of chaos in Gotham City.