The film stars CILLIAN MURPHY as J. Robert Oppenheimer and Golden Globe winner EMILY BLUNT as his wife, biologist and botanist Kitty Oppenheimer. Oscar® winner MATT DAMON portrays Leslie Groves, director of the Manhattan Project, and Oscar® nominee ROBERT DOWNEY, JR. plays Lewis Strauss, a founding commissioner of the U.S. Atomic Energy Commission.
Academy Award® nominee FLORENCE PUGH plays psychiatrist Jean Tatlock; JOSH HARTNETT plays pioneering American nuclear scientist Ernest Lawrence; Oscar® winner CASEY AFFLECK plays Boris Pash, chief of Army counter-intelligence at the Presidio in San Francisco; Oscar® winner RAMI MALEK plays David Hill, an associate experimental physicist; and Oscar® winning filmmaker and actor KENNETH BRANAGH plays Nobel Prize winning physicist Niels Bohr.
Also starring are BENNY SAFDIE (Licorice Pizza) as theoretical physicist Edward Teller, DYLAN ARNOLD (Halloween films) as Frank Oppenheimer, Robert’s younger brother; GUSTAF SKARSGÅRD (Air) as Manhattan Project member Hans Bethe; DAVID KRUMHOLTZ (The Ballad of Buster Scruggs) as Nobel Prize winning physicist Isidor Rabi; MATTHEW MODINE (The Dark Knight Rises) as Vannevar Bush, head of the U.S. Office of Scientific Research and Development; DAVID DASTMALCHIAN (Dune: Part One) as William Borden, a zealous advocate for U.S. nuclear superiority; and Oscar® nominee TOM CONTI (The Dark Knight Rises) as Albert Einstein.
The cast includes, as members of the Manhattan Project, Emmy nominee MICHAEL ANGARANO (Haywire) as Robert Serber, JACK QUAID (Logan Lucky) as Richard Feynman, JOSH PECK (Red Dawn) as Kenneth Bainbridge, OLIVIA THIRLBY (Juno) as Lilli Hornig, DANE DEHAAN (Valerian and the City of a Thousand Planets) as Kenneth Nichols and DANNY DEFERRARI (Shiva Baby) as Nobel Prize winner Enrico Fermi.
ALDEN EHRENREICH (Solo: A Star Wars Story) appears as a Senate Aide; JEFFERSON HALL (Tenet) plays Haakon Chevalier, a friend of Oppenheimer; JASON CLARKE (Zero Dark Thirty) plays special counsel Roger Robb; JAMES D’ARCY (Dunkirk) plays Patrick Blackett, Oppenheimer’s head tutor at Cambridge; and TONY GOLDWYN (King Richard) plays Gordon Gray, a former Secretary of the Army who chaired the 1954 committee overseeing the security clearance hearing of Oppenheimer.