Christopher Nolan's Oppenheimer has been one of the most highly-anticipated movies for a while now. For starters, Nolan is a proven genius with action films, and having yet another one set around WWII is a no-brainer for many. Oppenheimer is Nolan's first biopic, and it follows the story of J. Robert Oppenheimer's life and work on the Manhattan Project, which was a massive operation to develop the world's first nuclear weapon, the atomic bomb. Because of the period and the story's subject, the film's expected to be a nice blend of drama, historical thriller, and even a bit of a horror show. Even though a lot is still unknown about the movie's plot, the cast is quite impressive.
Source：https://www.cbr.com/oppenheimer-cast-character-guide/
