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Fat Man and Little Boy (1989)

1989 • 2h 7m • Drama, History • PG-13
IMDb6.5/109,923TMDB62%157Rotten Tomatoes50%Metacritic50
On September 27, 2026
#6189▼ 3292
6189th by Pulse movie online
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Most Popular Fat Man and Little Boy Cast Members

John Cusack is the most popular Fat Man and Little Boy cast member right now, with a Popularity Score of 4.36. Updated September 29, 2026.

#
Cast
Popularity
1

John Cusack

▼ 0.3Michael Merriman/23 years during filming
4.4
2

Laura Dern

▼ 0.2Kathleen Robinson/22 years during filming
3.7
3

Paul Newman

▼ 0.2Gen. Leslie R. Groves/64 years during filming
3.5
4

John C. McGinley

▲ 0.2Richard Schoenfield/30 years during filming
3.3
5

Bonnie Bedelia

▲ 0.1Kitty Oppenheimer/41 years during filming
3.3
6

Clark Gregg

▼ 0.2Douglas Panton/27 years during filming
3.1
7

Natasha Richardson

Jean Tatlock/26 years during filming
2.2
8

Dwight Schultz

J. Robert Oppenheimer/41 years during filming
2.0
9

James Eckhouse

Robert Harper/34 years during filming
1.8
10

Mary Pat Gleason

▲ 0.2Dora Welsh/39 years during filming
1.7
11

Madison Mason

▲ 0.3Boris Pash/46 years during filming
1.7
12

Arthur Holden

Oakridge Doctor/30 years during filming
1.6
13

Todd Field

▼ 0.3Robert Wilson/25 years during filming
1.5
14

Allan Corduner

▼ 0.1Franz Goethe/39 years during filming
1.5
15

Jon DeVries

▲ 0.4Johnny Mount/42 years during filming
1.3
16

Ed Lauter

▲ 0.1Whitney Ashbridge/50 years during filming
1.3
17

John Considine

▲ 0.1Robert Tuckson/54 years during filming
1.2
18

Joe D'Angerio

Seth Neddermeyer/40 years during filming
1.2
19

Ron Vawter

Jamie Latrobe/40 years during filming
1.2
20

Gerald Hiken

▲ 0.2Leo Szilard/62 years during filming
1.1
21

Del Close

Dr. Kenneth Whiteside/55 years during filming
0.9
22

Ron Frazier

▼ 0.1Peter de Silva/49 years during filming
0.8
23

Michael Brockman

William "Deke" Parsons
0.6
24

Donald MacKechnie

James Tuck/51 years during filming
0.5
25

Péter Halász

George Kistiakowsky/46 years during filming
0.5