Character Name : Gen. Leslie R. Groves

Original Name : Paul Newman

Gender : Male

Character Name : J. Robert Oppenheimer

Original Name : Dwight Schultz

Gender : Male

Character Name : Kitty Oppenheimer

Original Name : Bonnie Bedelia

Gender : Female

Character Name : Michael Merriman

Original Name : John Cusack

Gender : Male

Character Name : Kathleen Robinson

Original Name : Laura Dern

Gender : Female

Character Name : Peter de Silva

Original Name : Ron Frazier

Gender : Male

Character Name : Richard Schoenfield

Original Name : John C. McGinley

Gender : Male

Character Name : Jean Tatlock

Original Name : Natasha Richardson

Gender : Female

Character Name : Jamie Latrobe

Original Name : Ron Vawter

Gender : Male

Character Name : William "Deke" Parsons

Original Name : Michael Brockman

Gender : Male

Character Name : Dr. Kenneth Whiteside

Original Name : Del Close

Gender : Male

Character Name : Robert Tuckson

Original Name : John Considine

Gender : Male

Character Name : Franz Goethe

Original Name : Allan Corduner

Gender : Male

Character Name : Seth Neddermeyer

Original Name : Joe D'Angerio

Gender : Male

Character Name : Johnny Mount

Original Name : Jon DeVries

Gender : Male

Character Name : Robert Harper

Original Name : James Eckhouse

Gender : Male

Character Name : Robert Wilson

Original Name : Todd Field

Gender : Male

Character Name : Dora Welsh

Original Name : Mary Pat Gleason

Gender : Female

Character Name : Douglas Panton

Original Name : Clark Gregg

Gender : Male

Character Name : George Kistiakowsky

Original Name : Péter Halász

Gender : Male

Character Name : Leo Szilard

Original Name : Gerald Hiken

Gender : Male

Character Name : Oakridge Doctor

Original Name : Arthur Holden

Gender : Male

Character Name : Whitney Ashbridge

Original Name : Ed Lauter

Gender : Male

Character Name : James Tuck

Original Name : Donald MacKechnie

Gender : Male

Character Name : Boris Pash

Original Name : Madison Mason

Gender : Male

Character Name : Otto Frisch

Original Name : Krzysztof Pieczyński

Gender : Male

Character Name : Bronston

Original Name : Don Pugsley

Gender : Male

Character Name : Brehon Somervell

Original Name : Logan Ramsey

Gender : Male

Character Name : Melrose Hayden Barry

Original Name : Fred Thompson

Gender : Male

Character Name : Donald Hornig

Original Name : Jim True-Frost

Gender : Male

Character Name : Edward Teller

Original Name : Barry Yourgrau

Gender : Male

Character Name : Scientist

Original Name : Marek Alboszta

Gender : Male

Character Name : Dr. Avenell

Original Name : Steven Baigelman

Gender : Male

Character Name : Messenger

Original Name : Frank Benettieri Jr.

Gender : Male

Character Name : Frank Oppenheimer

Original Name : Roger Cubicciotti

Gender : Male

Character Name : Enrico Fermi

Original Name : Franco Cutietta

Gender : Male

Character Name : Dr. Louis Hempelman

Original Name : Robert Peter Gale

Gender : Male

Character Name : Peter Oppenheimer

Original Name : Wesley Harrison

Gender : Male

Character Name : Peter Oppenheimer

Original Name : Brent Harrison

Gender : Male

Character Name : Scientist

Original Name : Tom McFarlane

Gender : Male

Character Name : Raincoat Man

Original Name : David C. Parnes

Gender : Male

Character Name : Harold McDonald

Original Name : Allen Poirson

Gender : Male

Character Name : Robert Serber

Original Name : David Politzer

Gender : Male

Character Name : Times Reporter

Original Name : Bill Rubenstein

Gender : Male

Character Name : Observation Officer

Original Name : Ken Strausbaugh

Gender : Male

Character Name : Henry Stimson

Original Name : Walter Sullivan

Gender : Male

Character Name : Dennis Talmudge

Original Name : Brian Wandell

Gender : Male

Character Name : Mack Stoddard

Original Name : John Williams

Gender : Male

Character Name : (voice)

Original Name : Walker Edmiston

Gender : Male

Character Name : (voice)

Original Name : Matthew Faison

Gender : Male

Character Name : (voice)

Original Name : Stan Jones

Gender : Male

Character Name : (voice)

Original Name : Alan Oppenheimer

Gender : Male