Paul Newman Featured
as Gen. Leslie R. Groves
Dwight Schultz Featured
as J. Robert Oppenheimer
Bonnie Bedelia Featured
as Kitty Oppenheimer
John Cusack Featured
as Michael Merriman
Laura Dern Featured
as Kathleen Robinson
John C. McGinley
as Richard Schoenfield
Natasha Richardson
as Jean Tatlock
Del Close
as Dr. Kenneth Whiteside
James Eckhouse
as Robert Harper
Todd Field
as Robert Wilson
Mary Pat Gleason
as Dora Welsh
Clark Gregg
as Douglas Panton
Arthur Holden
as Oakridge Doctor
Ed Lauter
as Whitney Ashbridge
Madison Mason
as Boris Pash
Krzysztof Pieczyński
as Otto Frisch
Logan Ramsey
as Brehon Somervell
Fred Thompson
as Melrose Hayden Barry