Spanning 1938 to 1953, theoretical physicist Robert Oppenheimer leads the effort to develop the atom bomb during the Second World War. When revealed, his work initially makes him a hero in the United States, but an ever-changing world soon sees him recast as a security risk.

Sam WaterstonRobert Oppenheimer

John CarsonNarrator

Jana SheldenKitty Harrison

Christopher MunckeGeneral Kenneth Nichols

Edward HardwickeEnrico Fermi

David SuchetEdward Teller

Peter WhitmanRobert Serber

Manning RedwoodGeneral Leslie Groves

Matthew GuinnessHans Bethe

John MortonRobert Wilson

Bob ShermanErnest Lawrence

Garrick HagonFrank Oppenheimer

Liza RossJacky Oppenheimer

Kate HarperJean Tatlock

Erica StevensCharlotte Serber

Peter MarinkerHaakon Chevalier

Anthony ForrestRossi Lomanitz

Christopher MalcolmSteve Nelson

Daniel FoleyJoseph Weinberg

James SmithDr Harrison

Michael RyanStudent

Carl HauglandStudent

Raymond MarloweBusinessman

Ed DevereauxGeneral Wilhelm Styer

David OliverEmil Konopinski

Alexander DavionArthur Compton

Gabor VernonLeo Szilard

Colette HillerBarbara Chevalier

William HootkinsFBI Agent

John CassadyFBI Agent

Robert HendersonScientist

David BaxtColonel John Lansdale

Ron BerglasJohn Manley

Barry DennenIsidor Rabi

Shane RimmerEd Condon

Rosemary FaithMitzi Teller

Pat StarrAlice Smith

Sarah BrackettPriscilla Duffield

Billy J. MitchellCaptain 'Deke' Parsons

Colin BennettSeth Neddermeyer

Marc SmithLieutenant Colonel Boris Pash

John OrchardSergeant

Blain FairmanRobert Bacher

Dave HillJames Tuck

Milton JohnsGeorge Kistiakowsky

Albert WellingKlaus Fuchs

Douglas LambertKenneth Bainbridge

Tony SibbaldCaptain

Matt ZimmermanMC

Jay BenedictSED

Gerramy QuartoSED

Nigel AnthonyScientist

Roger FrazierDrill Sergeant

Geri PetersonWoman

Alexander KnoxHenry Stimson

Ed BishopGeneral Tom Farrell

Michael John PaliottiSam Allison

Jeff HardingMP

Don FellowsArmy Chief

Robert MacLeodNavy Chief

Douglas W. IlesAir Force Chief

Peter BanksJoseph Volpe

Phil BrownLewis Strauss

Bob SessionsThomas Finletter

Robert RobinsonSenator Knowland

Stephen TurnerDavid Griggs

Ray CharlesonWilliam Borden

Raymond ThompsonFrancis Cotter

Audrey HamiltonCarol Chevalier

James WaterstonPeter Oppenheimer

Elizabeth GilesToni Oppenheimer

Declan MulhollandFBI Agent

Jerry HarteJCAE Counsel

Robert O'NeilGAC Committee Member

Peter CarlisleHUAC Counsel

Alan WestbrookReporter

James BerwickAir Force General

Michael FitzpatrickCongressman

George GabrielHarold Green

Stuart MilliganHerbert Marks

James MaxwellLloyd Garrison

Philip O'BrienRoger Robb

Seymour GreenGordon Gray

Robert ArdenJohn McCloy