Many characters come and go in Oppenheimer, and there are plenty of cameos that cause a major impression on the audience. More than just small characters who appear to say one or two lines, these characters are highly impactful to the story despite their brief screen time, and no better way to impact viewers than casting renowned movie stars to take over these roles. Oppenheimer is one of Christopher Nolan's most ambitious projects and covers the real-life story of the controversial J. Robert Oppenheimer, the mastermind behind the creation of the atomic bomb. Following Oppenheimer from his younger years until the aftermath of World War II, the extensive set of characters and the powerful cameos add up to a rich, nuanced narrative around one of the world's most complex historical figures. James D'Arcy as Patrick Blackett James D'Arcy appears right at the beginning of the film as Patrick Blackett, a ruthless professor whom Oppenheimer attempted to poison during his academic years. Blacke...
