Character Relationship Map: Day One

Characters

• J. Robert Oppenheimer (played by David Strathairn) — supporting

  A physicist chosen by General Leslie Groves to head the Los Alamos Laboratory in New Mexico. Oppenheimer leads the laboratory where the atomic bomb is built, making him a central scientific figure in...

• Leo Szilard (played by Michael Tucker) — supporting

  A Hungarian physicist whose warnings about a possible German atomic bomb help initiate the Manhattan Project. After fleeing Europe, he persuades the U.S. government to build a bomb with help from Albe...

• President Harry S. Truman (played by Richard Dysart) — supporting

  The U.S. president who weighs possible ways to end the war with Japan, including negotiations, blockade, invasion, and use of the atomic bomb. He ultimately chooses to drop the bomb on Hiroshima, desp...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• President Harry S. Truman → J. Robert Oppenheimer (Power Political Authority Over Project) — Truman represents the government authority governing the project and its ultimate military application.

  The Manhattan Project operates under federal authority, and Truman later evaluates the consequences of the bomb developed at Oppenheimer's Los Alamos...

• Leo Szilard → J. Robert Oppenheimer (Professional Project Colleague) — They occupy connected scientific roles within the Manhattan Project, although the plot does not establish a close personal partnership.

  Leo Szilard's advocacy helps initiate the Manhattan Project, while J. Robert Oppenheimer heads the Los Alamos laboratory where the bomb is built.

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Leo Szilard → President Harry S. Truman (Conflict Policy Opponent) — Szilard argues against the course Truman chooses.

  Leo Szilard helps organize a petition against building or using the bomb, while President Harry S. Truman ultimately decides to use it against Hiroshi...

Story Analysis

The film follows the creation of the atomic bomb from wartime warning to a moral and political decision about its use.

Plot Progression

1. Escape and Unheard Warning — Leo Szilard escapes Germany and tries to alert British authorities that a nuclear bomb can be built. His proposal is filed and ignored, forcing him to seek another route.
2. The Project Takes Shape — In the United States, Szilard helps persuade the federal government to authorize a bomb project. Oppenheimer is selected to lead the Los Alamos laboratory, where construction begins.
3. Victory Changes the Question — Germany is defeated, and interrogations show that its scientists were far from producing a bomb. The project nevertheless continues, while Szilard begins to question the weapon he helped set in motion...
4. The Decision at the End — Szilard supports a petition against the bomb, but the military withholds it. Truman weighs several alternatives and decides to use the bomb on Hiroshima despite opposition.