Cillian Murphy will play the father of the hydrogen bomb, J. Robert Oppenheimer. A man who, despite inventing the deadly weapon, wanted to place International controls on his dangerous invention, post-Hiroshima. Director Christopher Nolan is currently in post on the film. Filming had started on February 21 and ended on May 22 with a cast that includes Murphy, Matt Damon, Emily Blunt, Florence Pugh. Rami Malek and Robert Downey Jr.