American Playhouse

Sam Waterston

Robert Oppenheimer

Edward Herrmann

The Headmaster

John Carson

Narrator (voice)

David Suchet

Joe

Jana Shelden

Kitty Oppenheimer

Edward Hardwicke

Enrico Fermi

Christopher Muncke

Colonel Kenneth Nichols

Sada Thompson

Widow Douglas

Hallie Foote

Elizabeth Vaughn

Jeffrey DeMunn

George

Paul Guilfoyle

Peter Whitman

Robert Serber

Manning Redwood

General Leslie Groves

Matthew Guinness

Hans Bethe

Elizabeth Franz

Mrs. Griffin

Barton Heyman

Jack

Frederic Forrest

Pap Finn

Josh Hamilton

Lovely Mead

Robert Joy

Mr. Tapping

Tom Aldredge

Judge Mark Driscoll

John Morton

Robert Wilson

Garrick Hagon

Frank Oppenheimer

Bob Sherman

Ernest Lawrence

Barry Dennen

Isidor Rabi

Gloria Foster

Lee

Deanna Dunagan

Emily Dickenson

Maria Tucci

Priscilla Hiss

Peter Riegert

Richard M. Nixon

John Harkins

Whittaker Chambers

Ken Howard

Sam Evans

Giancarlo Esposito

Simon Fernandes

William Hootkins

FBI Agent

Patrick Day

Huckleberry Finn

Eugene Oakes

Tom Sawyer

Samm-Art Williams

Jim

James Eckhouse

Steven

David Dukes

Dr. Ned Darrell

Victor Garber

John White

Victor Wong

Fung Leung

Pepe Serna

Manuel Flores