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Fat Man and Little Boy

Fat Man and Little Boy Cast

52 cast members · 27 with popularity data
#5,324 movie today
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Most Popular Fat Man and Little Boy Cast Members

Natasha Richardson is currently the most popular Fat Man and Little Boy cast member online with an Attention Score of 4.4. 1 of 52 cast members rank in the top 1,000 actors online today. Updated October 23, 2026.

1
Natasha Richardson
Jean Tatlock
4.4
#957 overall
2
Paul Newman
Gen. Leslie R. Groves
4.0
#1,126 overall
3
Laura Dern
Kathleen Robinson
3.0
#1,741 overall
4
John Cusack
Michael Merriman
2.8
#1,903 overall
5
John C. McGinley
Richard Schoenfield
1.6
#3,753 overall
6
Bonnie Bedelia
Kitty Oppenheimer
1.3
#4,821 overall
7
Clark Gregg
Douglas Panton
0.9
#6,523 overall
8
Fred Thompson
Melrose Hayden Barry
0.9
#6,720 overall
9
Dwight Schultz
J. Robert Oppenheimer
0.8
#7,772 overall
10
Ed Lauter
Whitney Ashbridge
0.6
#9,253 overall
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11
Todd Field
Robert Wilson
0.5
#10,833 overall
12
Alan Oppenheimer
(voice)
0.4
#13,407 overall
13
James Eckhouse
Robert Harper
0.2
#18,590 overall
14
Del Close
Dr. Kenneth Whiteside
0.2
#20,296 overall
15
Jim True-Frost
Donald Hornig
0.2
#21,823 overall
16
John Considine
Robert Tuckson
0.1
#26,286 overall
17
Logan Ramsey
Brehon Somervell
0.1
#26,498 overall
18
Allan Corduner
Franz Goethe
0.1
#27,883 overall
19
Mary Pat Gleason
Dora Welsh
0.1
#29,553 overall
20
Ron Vawter
Jamie Latrobe
0.1
#30,185 overall
21
Walker Edmiston
(voice)
0.1
#30,930 overall
22
Arthur Holden
Oakridge Doctor
0.1
#32,883 overall
23
Stan Jones
(voice)
0.1
#36,091 overall
24
Krzysztof Pieczyński
Otto Frisch
0.0
#52,092 overall
25
Gerald Hiken
Leo Szilard
0.0
#54,643 overall
26
Péter Halász
George Kistiakowsky
0.0
#59,141 overall
27
Steven Baigelman
Dr. Avenell
0.0
#61,386 overall
28
Ron Frazier
Peter de Silva
—
29
Michael Brockman
William "Deke" Parsons
—
30
Joe D'Angerio
Seth Neddermeyer
—
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31
Jon DeVries
Johnny Mount
—
32
Donald MacKechnie
James Tuck
—
33
Madison Mason
Boris Pash
—
34
Don Pugsley
Bronston
—
35
Barry Yourgrau
Edward Teller
—
36
Marek Alboszta
Scientist
—
37
Frank Benettieri Jr.
Messenger
—
38
Roger Cubicciotti
Frank Oppenheimer
—
39
Franco Cutietta
Enrico Fermi
—
40
Robert Peter Gale
Dr. Louis Hempelman
—
41
Wesley Harrison
Peter Oppenheimer
—
42
Brent Harrison
Peter Oppenheimer
—
43
Tom McFarlane
Scientist
—
44
David C. Parnes
Raincoat Man
—
45
Allen Poirson
Harold McDonald
—
46
David Politzer
Robert Serber
—
47
Bill Rubenstein
Times Reporter
—
48
Ken Strausbaugh
Observation Officer
—
49
Walter Sullivan
Henry Stimson
—
50
Brian Wandell
Dennis Talmudge
—
51
John Williams
Mack Stoddard
—
52
Matthew Faison
(voice)
—
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