J. Oppenheimer, Atomphysiker

Sam Waterston

Robert Oppenheimer

John Carson

Narrator

Jana Shelden

Kitty Harrison

Christopher Muncke

General Kenneth Nichols

Edward Hardwicke

Enrico Fermi

David Suchet

Edward Teller

Peter Whitman

Robert Serber

Manning Redwood

General Leslie Groves

Matthew Guinness

Hans Bethe

John Morton

Robert Wilson

Bob Sherman

Ernest Lawrence

Garrick Hagon

Frank Oppenheimer

Barry Dennen

Isidor Rabi

Liza Ross

Jacky Oppenheimer

Kate Harper

Jean Tatlock

Erica Stevens

Charlotte Serber

Peter Marinker

Haakon Chevalier

Ron Berglas

John Manley

Blain Fairman

Robert Bacher

Anthony Forrest

Rossi Lomanitz

Christopher Malcolm

Steve Nelson

William Hootkins

FBI Agent

John Cassady

FBI Agent

David Baxt

Colonel John Lansdale

Rosemary Faith

Mitzi Teller

Sarah Brackett

Priscilla Duffield

Billy J. Mitchell

Captain 'Deke' Parsons

Colin Bennett

Seth Neddermeyer

Milton Johns

George Kistiakowsky

Douglas Lambert

Kenneth Bainbridge

Nigel Anthony

Scientist

Peter Banks

Joseph Volpe

Phil Brown

Lewis Strauss

Daniel Foley

Joseph Weinberg

James Smith

Dr Harrison

Michael Ryan

Student

Carl Haugland

Student

Raymond Marlowe

Businessman

Ed Devereaux

General Wilhelm Styer

David Oliver

Emil Konopinski

Alexander Davion

Arthur Compton

Gabor Vernon

Leo Szilard

Colette Hiller

Barbara Chevalier

Robert Henderson

Scientist

Shane Rimmer

Ed Condon

Pat Starr

Alice Smith

Marc Smith

Lieutenant Colonel Boris Pash

John Orchard

Sergeant

Dave Hill

James Tuck

Albert Welling

Klaus Fuchs

Tony Sibbald

Captain

Matt Zimmerman

MC

Jay Benedict

SED

Gerramy Quarto

SED

Roger Frazier

Drill Sergeant

Geri Peterson

Woman

Alexander Knox

Henry Stimson

Ed Bishop

General Tom Farrell

Michael John Paliotti

Sam Allison

Jeff Harding

MP

Don Fellows

Army Chief

Robert MacLeod

Navy Chief

Douglas W. Iles

Air Force Chief

Bob Sessions

Thomas Finletter

Robert Robinson

Senator Knowland

Stephen Turner

David Griggs

Ray Charleson

William Borden

Raymond Thompson

Francis Cotter

Audrey Hamilton

Carol Chevalier

James Waterston

Peter Oppenheimer

Elizabeth Giles

Toni Oppenheimer

Declan Mulholland

FBI Agent

Jerry Harte

JCAE Counsel

Robert O'Neil

GAC Committee Member

Peter Carlisle

HUAC Counsel

Alan Westbrook

Reporter

James Berwick

Air Force General

Michael Fitzpatrick

Congressman

George Gabriel

Harold Green

Stuart Milligan

Herbert Marks

James Maxwell

Lloyd Garrison

Philip O'Brien

Roger Robb

Seymour Green

Gordon Gray

Robert Arden

John McCloy