Fat Man and Little Boy

Movie review by
Barbara Shulgasser-Parker, Common Sense Media
Fat Man and Little Boy Movie Poster Image
Drama about development of atomic bomb; violence, language.
  • PG-13
  • 1989
  • 127 minutes

Parents say

age 2+
Based on 1 review

Kids say

No reviews yetAdd your rating

Did this review miss something on diversity?

Research shows a connection between kids' healthy self-esteem and positive, diverse representations in books, TV shows, and movies. Want to help us help them? Suggest a diversity update

A lot or a little?

The parents' guide to what's in this movie.

Positive Messages

People with the biggest explosives sometimes win. Scientists can be so excited about discovering great solutions to difficult problems that they can lose sight of the terrible consequences their solutions might create. Humans are as instinctively prepared to help others as to kill others.

Positive Role Models & Representations

Many brilliant and arrogant scientists wanted to be known for tackling the bomb's technical problems and didn't think through the devastating effects their work could have. Many military leaders wanted the biggest weapon they could find and were therefore far less interested in diplomatic negotiations that might also end the war with far less bloodshed.


Bombs dropped in Hiroshima and Nagasaki killed more than 200,000 Japanese citizens, largely civilians, including women, children, old people. Owing to clumsy error at end of countdown before explosion, man closest to the device grabs it to keep from killing everyone around. His bravery saves others but he burns from inside out within hours. Some of his burns, wounds are shown. A woman commits suicide offscreen.


A woman tells a man she wants to make love. They kiss. Oppenheimer, who is married, carries on a long-term affair with a woman who is a Communist.


"S--t," "ass," "pecker," and "bosom." Military officers call Japanese "yellow monkeys."

Drinking, Drugs & Smoking

Adults drink alcohol and smoke cigarettes and cigars.

What parents need to know

Parents need to know that 1989's Fat Man and Little Boy looks at the real-life top-secret story of American and international scientists gathered by the U.S. military in 1942 to create the nuclear weapons that would kill more than 200,000 Japanese and end World War II. The movie outlines some of the technical challenges of unleashing and then harnessing atomic energy for the purpose of war, and raises the moral dilemmas some of the scientists and even some in the military faced as completion of the bombs neared. Massive human casualties were the goal of the weapon, so horrific violence is an underlying theme, which is amplified when one scientist suffers close-hand radiation exposure and dies a slow, harrowing death without any hope of treatment or cure. There will be much to discuss among teens regarding the good and evil that were created by this well-meaning team. Language includes "s--t," "ass," and "pecker." Military officers call Japanese "yellow monkeys." A married man carries on a long-term affair with a woman who is a Communist. Adults drink alcohol and smoke cigarettes and cigars. A woman commits suicide offscreen.

User Reviews

  • Parents say
  • Kids say
Adult Written byvbnvcnb August 18, 2020

what is this

what is this garbage fat man isnt even fat what

There aren't any reviews yet. Be the first to review this title.

What's the story?

FAT MAN AND LITTLE BOY were the nicknames given to the world's first two atomic bombs created in a remote, top-secret military enclave in Los Alamos, New Mexico, during World War II. General Leslie Groves (Paul Newman) is charged with assembling the best and brightest physicists, explosives experts, and mathematicians, including some refugees from Germany and Italy who deplored what their own countries were doing during the war. With less than two years to work and at a cost of around two billion dollars, scientists create massive weapons with the thought that deploying them can help end the war sooner and save countless lives. J. Robert Oppenheimer (Dwight Schultz), a Berkeley physicist, is selected to run the project. He chooses to set competing scientists against each other to help move the work forward. Still, doubt remains strong that their goal can even be accomplished. At the same time, Oppenheimer's affair with a known Communist makes him a security threat. After he's forced to break it off with her by his military bosses, the woman commits suicide. The general chooses not to share confirmation that the Germans are far behind in the race to create a nuclear weapon, certain that the Jews and pacifists among his scientists will quit the work "if you take Hitler out of the equation." One young scientist dies of painful radiation poisoning after an accident during an experiment. Scientists don't start articulating their moral and ethical hesitations about the terrible repercussions of the project until it's nearly finished. Personal and political positions emerge among the ranks, but officers and government officials who want the weapon built suppress the protests. In 1945, after the Germans surrender, but with the war against Japan still raging, a demo weapon is successfully detonated in the desert. A few weeks later, the bomb is dropped on Hiroshima, Japan, and days later on Nagasaki. More than 200,000 Japanese are killed. 

Is it any good?

The facts that underlie this film are fascinating enough to provide this otherwise plodding movie with narrative momentum and historical heft. There's plenty to think about. Was Oppenheimer really that arrogant and oblivious? Teens interested in history and science may want to discuss the way proliferation of nuclear weapons today seems to make the world a less stable place despite hope decades ago that their creation was supposed to make the world more stable and more peaceful. 

Fat Man and Little Boy tosses about lots of technical terms as if to assure us that we're watching actual scientists. For example, "The spontaneous fission rate is way too high," and there's a need to "focus an explosive shock wave." Conversation between a scientist and his wife about the indecency of creating weapons of mass destruction also feels forced. The meatiest issues arise as if by surprise at the very end, as when a scientist bets that the test could wipe out New Mexico, even ignite the atmosphere and "finish off the planet." The television series Manhattan handles all of this far more believably. Understandably, many fascinating pieces of this complicated story are omitted, including how to create the necessary radioactive materials, competing methods of making the materials react, the infiltration of the American program by Soviet spies, and the role of British and Canadian collaborators.

Talk to your kids about ...

  • Families can talk about final arguments posed by both the scientists and some military officers regarding how to use the bomb. Why do you think some wanted to invite enemy Japanese officials to watch the demonstration of the weapon's first detonation? Do you think the terrifying power of the explosion would have made the Japanese surrender, leaving no need to actually drop the bomb, or do you think the war would have continued anyway?

  • Defenders of dropping the bombs in Fat Man and Little Boy say that thousands of American soldiers fighting Japan were saved by dropping the bombs, and that justified the mass destruction and killing. Do you agree or disagree?

  • Some scientists only began to worry about the damage such weapons could cause when the weapons were nearly finished and ready to use. Why do you think they delayed considering the moral implications of making weapons so late into the process?

Movie details

Our editors recommend

For kids who love history

Common Sense Media's unbiased ratings are created by expert reviewers and aren't influenced by the product's creators or by any of our funders, affiliates, or partners.

See how we rate

Streaming options powered by JustWatch

About these links

Common Sense Media, a nonprofit organization, earns a small affiliate fee from Amazon or iTunes when you use our links to make a purchase. Thank you for your support.

Read more

Our ratings are based on child development best practices. We display the minimum age for which content is developmentally appropriate. The star rating reflects overall quality.

Learn how we rate