Cillian Murphy as J. Robert Oppenheimer takes the award home for the best actor. He brings depth to his character with his charisma and gives a brilliant performance. You cannot take your eyes off him. After playing supporting roles for Christopher Nolan, it is clear that Cillian got the stage to showcase how extraordinary he is. Every close-up scene which includes him is equally captivating as the atomic bomb. The character was not easy to play but Cillian managed to ace every emotion.  Robert Downey Jr. plays the role of Oppenheimer's rival, Lewis Strauss. The power he holds on screen is unmatched. While we have seen him as our beloved Iron Man, it was surprising to watch him play such a significant character. He gives his 100% to this character and it shows. The best part is how he is the total opposite of Cillian. His character creates the balance perfectly and we get to witness a sensational performance.