Peacock is a psychological thriller where Cillian Murphy plays the role of John Skillpa, a man with dissociative identity disorder. The movie explores the complex and troubled life of John, who lives with two distinct personalities, John and Emma. Murphy's performance is exceptional as he seamlessly transitions between the two characters, showcasing his versatility as an actor. Peacock delves into the dark and mysterious world of John's mind, keeping the audience intrigued and captivated until the very end.