J. Robert Oppenheimer

Cillian Murphy

Kitty Oppenheimer

Emily Blunt

Lewis Strauss

Robert Downey Jr.

Leslie Groves

Matt Damon

David Hill

Rami Malek

Senate Aide

Alden Ehrenreich

Counsel

Scott Grimes

Jean Tatlock

Florence Pugh

Ernest Lawrence

Josh Hartnett

Roger Robb

Jason Clarke

Edward Teller

Benny Safdie

Thomas Morgan

Kurt Koehler

Boris Pash

Casey Affleck

Robert Serber

Michael Angarano

Gordon Gray

Tony Goldwyn

Niels Bohr

Kenneth Branagh

Ward Evans

John Gowans

Kenneth Nichols

Dane DeHaan

Lloyd Garrison

Macon Blair

Patrick Blackett

James D'Arcy

Frank Oppenheimer

Dylan Arnold

Kenneth Bainbridge

Josh Peck

Senator McGee

Harry Groener

Albert Einstein

Tom Conti

Isidor Rabi

David Krumholtz

Chairman Magnuson

Gregory Jbara

William Borden

David Dastmalchian

Senator Bartlett

Ted King

Vannevar Bush

Matthew Modine

Senator Pastore

Tim DeKay

Senator Scott

Steven Houska

Haakon Chevalier

Jefferson Hall

Dutch Student

Petrie Willink

Werner Heisenberg

Matthias Schweighöfer

Luis Alvarez

Alex Wolff

Rossi Lomanitz

Josh Zuckerman

Hartland Snyder

Rory Keane

Jackie Oppenheimer

Emma Dumont

Mary Washburn

Sadie Stratton

Barbara Chevalier

Britt Kyle

George Eltenton

Guy Burnet

Richard Tolman

Tom Jenkins

Ruth Tolman

Louise Lombard

Joe Volpe

Michael Andrew Baker

Congressman

Jeff Hephner

Edward Condon

Olli Haaskivi

Donald Hornig

David Rysdahl

Richard Feynman

Jack Quaid

Concerned Scientist

Brett DelBuono

Hans Bethe

Gustaf Skarsgård

Kurt Gödel

James Urbaniak

George Kistiakowsky

Trond Fausa Aurvåg

Seth Neddermeyer

Devon Bostick

Enrico Fermi

Danny Deferrari

Klaus Fuchs

Christopher Denham

Charlotte Serber

Jessica Erin Martin

J. Ernest Wilkins

Ronald Auguste

Leo Szilard

Máté Haumann

Lilli Hornig

Olivia Thirlby

Lyall Johnson

Jack Cutmore-Scott

Philip Morrison

Harrison Gilbertson

Henry Stimson

James Remar

George C. Marshall

Will Roberts

James Byrnes

Pat Skipper

James Conant

Steve Coulter

AAF Officer

Jeremy John Wells

Weatherman

Sean Avery

Army Captain

Adam Kroeger

Soldier

Drew Kenney

AAF Officer 2

Bryce Johnson

Burn Victim

Flora Nolan

Laughing Woman

Kerry Westcott

Kissing Woman

Christina Hogue

Kissing Man

Clay Bunker

Weeping Man

Tyler Beardsley

Consoling Woman

Maria Teresa Zuppetta

Presidential Aide

Kate French

Harry Truman

Gary Oldman

Lyndon Johnson

Hap Lawrence