Trailer
Cast
Kenneth Branagh
Niels Bohr
Máté Haumann
Leo Szilard
Kerry Westcott
Laughing Woman
Gary Oldman
Harry Truman
James D'Arcy
Patrick Blackett
Alden Ehrenreich
Senate Aide
Tony Goldwyn
Gordon Gray
Rory Keane
Hartland Snyder
Clay Bunker
Kissing Man
John Gowans
Ward Evans
Alex Wolff
Luis Alvarez
Tom Jenkins
Richard Tolman
Drew Kenney
Soldier
Kate French
Presidential Aide
Meg Schimelpfenig
Senator's Assistant (uncredited)
Josh Peck
Kenneth Bainbridge
Devon Bostick
Seth Neddermeyer
Rami Malek
David Hill
Scott Grimes
Counsel
Harry Groener
Senator McGee
Gregory Jbara
Chairman Magnuson
Emma Dumont
Jackie Oppenheimer
David Rysdahl
Donald Hornig
Florence Pugh
Jean Tatlock
Ted King
Senator Bartlett
Ronald Auguste
J. Ernest Wilkins
Harrison Gilbertson
Philip Morrison
Will Roberts
George C. Marshall
Bryce Johnson
AAF Officer 2
Flora Nolan
Burn Victim
Maria Teresa Zuppetta
Consoling Woman
Josh Zuckerman
Rossi Lomanitz
Britt Kyle
Barbara Chevalier
Adam Kroeger
Army Captain
Hap Lawrence
Lyndon Johnson
Matt Damon
Leslie Groves
Jason Clarke
Roger Robb
Steven Houska
Senator Scott
Matthias Schweighöfer
Werner Heisenberg
Guy Burnet
George Eltenton
Olivia Thirlby
Lilli Hornig
Emily Blunt
Kitty Oppenheimer
Dylan Arnold
Frank Oppenheimer
Tom Conti
Albert Einstein
Tim DeKay
Senator Pastore
James Urbaniak
Kurt Gödel
Christopher Denham
Klaus Fuchs
Steve Coulter
James Conant
David Krumholtz
Isidor Rabi
Robert Downey Jr.
Lewis Strauss
Jack Quaid
Richard Feynman
Brett DelBuono
Concerned Scientist
Trond Fausa Aurvåg
George Kistiakowsky
Pat Skipper
James Byrnes
Gustaf Skarsgård
Hans Bethe
Kurt Koehler
Thomas Morgan
Michael Angarano
Robert Serber
Sadie Stratton
Mary Washburn
Tyler Beardsley
Weeping Man
Cillian Murphy
J. Robert Oppenheimer
Casey Affleck
Boris Pash
Macon Blair
Lloyd Garrison
Jeff Hephner
Congressman
Olli Haaskivi
Edward Condon
David Dastmalchian
William Borden
Matthew Modine
Vannevar Bush
Benny Safdie
Edward Teller
Dane DeHaan
Kenneth Nichols
Jefferson Hall
Haakon Chevalier
Petrie Willink
Dutch Student
Louise Lombard
Ruth Tolman
Danny Deferrari
Enrico Fermi
Jessica Erin Martin
Charlotte Serber
James Remar
Henry Stimson
Josh Hartnett
Ernest Lawrence
Michael Andrew Baker
Joe Volpe
Jack Cutmore-Scott
Lyall Johnson
Jeremy John Wells
AAF Officer
Sean Avery
Weatherman
Christina Hogue
Kissing Woman