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Read the complete plot summary and ending explained for The Beginning of the End (2020). From turning points to emotional moments, uncover what really happened and why it matters.
In a framing segment, Joel Zito Araújo appears as himself, guiding viewers through a documentary that traces the rise of atomic energy and the race to harness it, presenting the material as part of a time-honored package of knowledge to be sealed away in a California time capsule for the year 2446.
A prelude newsreel sets the mood, balancing awe with concern as it introduces the central tension: the extraordinary promise of a new source of power alongside the immense danger it represents. The film then centers on key figures who shape this history. Dr. J. Robert Oppenheimer, a renowned physicist, voices both admiration for the discovery and a warning that such power must be handled with the utmost responsibility. Discussions among leading scientists unfold, including Matt Cochran, who works under guidance from Dr. Enrico Fermi and Dr. Marré, and who, along with Einstein’s input, helps convey the gravity of their findings to higher authorities, such as President Franklin D. Roosevelt.
As the nation enters war, the narrative moves forward to the moment Roosevelt authorizes a massive commitment to the Manhattan Project—amounting to as much as two billion dollars to push ahead with development. The story tracks the astonishing progress of 1942, when, at the University of Chicago, a controlled chain reaction is created in a controlled setting under the watchful eyes of observers like Lieutenant Colonel Jeff Nixon. General Leslie Groves is placed in charge, charged with assembling the vast network of scientists, industries, and defense resources needed to bring the project to fruition. The film then follows the arc into 1945, after Roosevelt’s passing, with President Harry S. Truman continuing support and the project relocating to Los Alamos, New Mexico, where the team pursues a single, momentous goal.
As the war against Japan intensifies, the narrative explains Truman’s decision to proceed with the use of the atomic bomb, a choice that carries monumental implications for military strategy and international power. Cochran and Nixon become part of the team assigned to transport the explosive device to Tinian, a mission that intensifies the stakes of every step along the way. Tragedy intersects with progress when Cochran encounters radioactive material and dies, a stark reminder of the personal costs behind breakthroughs. The following day, history takes a decisive turn: the Enola Gay, a Boeing B-29 Superfortress, drops the atomic bomb on Hiroshima on August 6, 1945, marking a pivotal moment in the war and in global science policy.
Back home, the consequences ripple outward as Nixon returns to share the devastating news with Cochran’s wife, offering a human perspective on the broader upheaval caused by these events. The film maintains a steady, documentary tone throughout, presenting a sequence of linked episodes that together illustrate how a scientific triumph became a defining moment of modern history, shaping political decisions, battlefield tactics, and ethical debates for generations to come.
Follow the complete movie timeline of The Beginning of the End (2020) with every major event in chronological order. Great for understanding complex plots and story progression.
Opening Newsreel: Time capsule seeds atomic knowledge for posterity
A newsreel frames atomic energy as a cornerstone of modern science while hinting at the dangers it poses. It reveals a time capsule buried in California to be opened in 2446, linking present discoveries to a distant future. The scene sets the film's theme of knowledge vs. power.
Oppenheimer warns of the dangers of atomic energy
Dr. J. Robert Oppenheimer extols the achievement of splitting the atom but cautions about its potential for devastation. The scientist's dual stance foreshadows moral concerns that underpin the project. He addresses the need for responsible stewardship of such power.
Scientists accelerate the war effort and beat Germany in the race
Matt Cochran and colleagues push forward, under the guidance of Enrico Fermi and Marré, to harness atomic energy. The narrative frames their success as a pivotal advantage in World War II. The tension between scientific triumph and moral risk is established.
Einstein and Roosevelt acknowledge the monumental discovery
With Einstein's help, scientists inform President Roosevelt that a groundbreaking development has been achieved. The moment signals a turning point toward national mobilization for a nuclear program. It sets the stage for government support to accelerate research.
Roosevelt authorizes Manhattan Project funding
In a wartime decision, President Roosevelt approves up to two billion dollars for the Manhattan Project. The funding underwrites the collaboration of science, industry, and defense. The plan gains official support and resources to scale up development.
First nuclear chain reaction achieved at the University of Chicago
In December 1942, a sustained chain reaction occurs under a stadium on the University of Chicago campus, witnessed by military observers and international scientists. The event marks a practical breakthrough in harnessing atomic energy. It proves the viability of controlled fission and catalyzes further development.
Nixon assigned to Groves and Groves is put in charge
Lieutenant Colonel Jeff Nixon is assigned to General Leslie Groves, who is placed in charge of the atomic project. The military leadership consolidates control over the research, production, and security aspects. This organizational step solidifies the project’s direction.
The project moves to Los Alamos and Truman takes office
After President Roosevelt's death, Harry S. Truman supports expanding the program, which relocates to Los Alamos, New Mexico. This transfer centralizes the scientific teams and weapons design. The move signals escalating urgency in weapon development.
Truman orders use of the atomic bomb
In July 1945, President Truman authorizes the deployment of atomic weaponry to hasten victory in the Pacific War. Military strategy shifts toward a demonstration of power and possible decisive effect. The decision triggers the final stages of production and deployment.
Cochran and Nixon head to Tinian with the bomb
Cochran and Nixon join the team transporting the bomb to Tinian Island. They prepare for the assembly and delivery as the war nears its critical phase. The mission intensifies the personal risks of scientists and soldiers alike.
Cochran dies after exposure to radioactive material
During bomb assembly, Cochran confronts dangerous radioactive fallout and dies as a consequence. His death highlights the hidden costs of frontier science and the human toll behind the technology. Nixon's mission continues despite the tragedy.
Hiroshima is bombed by the Enola Gay
On August 6, 1945, the Enola Gay drops an atomic bomb on Hiroshima, marking the first use of nuclear weapons in war. The devastation accelerates the end of World War II in the Pacific. The event forces a swift shift in global geopolitics and ethics.
Nixon returns home to inform Cochran's wife of his death
After the mission, Nixon returns to the United States to break the tragic news to Cochran's widow. The personal consequences of wartime science emerge as families absorb loss. The film closes the timeline with the human cost behind victory.
Explore all characters from The Beginning of the End (2020). Get detailed profiles with their roles, arcs, and key relationships explained.
Dr. J. Robert Oppenheimer (Hume Cronyn)
A renowned physicist who extols atomic energy's potential yet warns of its dangers. He embodies the moral tension faced by scientists who balance curiosity with responsibility as the project advances.
General Leslie Groves (Brian Donlevy)
The military leader tasked with uniting science, industry, and defense to build the bomb. He is methodical, strategic, and relentless in pushing the project forward under wartime secrecy.
Lt. Col. Jeff Nixon (Robert Walker)
An officer assigned to oversee operations and transport logistics for the bomb. He represents the military voice in the project and faces the human cost of their work.
Matt Cochran (Tom Drake)
A scientist on the project who comes into contact with radioactive material and dies, illustrating the personal risks of nuclear research.
Dr. Enrico Fermi (Joseph Calleia)
A pioneering physicist who helps guide the project's scientific development as part of the international effort to unlock fission.
Albert Einstein (Ludwig Stössel)
A symbolic figure who informs Roosevelt of the monumental discovery, underscoring the global dimension and ethical stakes of the research.
President Franklin D. Roosevelt (Godfrey Tearle)
The wartime president who authorizes substantial funding for the Manhattan Project, initiating the United States' race to build the bomb.
President Harry S. Truman (Art Baker)
The successor who maintains support for the project and ultimately orders the use of the atomic bomb against Japan.
Joel Zito Araújo (himself)
A cameo appearance as himself within the film's newsreel framing, contributing to the documentary-style presentation of historical events.
Learn where and when The Beginning of the End (2020) takes place. Explore the film’s settings, era, and how they shape the narrative.
Time period
1941-1945
The story unfolds during World War II, as the United States accelerates its Manhattan Project to beat the Axis powers in the race to a functional atomic bomb. Major milestones include Roosevelt's wartime funding, the 1942 chain reaction, and the 1945 deployment over Hiroshima. The period is marked by rapid scientific breakthroughs, industrial scale production, and intense political and ethical debates about weaponization.
Location
Chicago, Los Alamos, Hiroshima, Tinian, California
Set across multiple locations: Chicago, where the first controlled nuclear chain reaction occurs at the University of Chicago; Los Alamos, the secret laboratory in New Mexico where the bomb is developed; Hiroshima, Japan, the target of the first atomic bombing; and Tinian, the Pacific island base used for deployment. California frames the film with a time-capsule newsreel suggesting the future opening of the record in 2446.
Discover the main themes in The Beginning of the End (2020). Analyze the deeper meanings, emotional layers, and social commentary behind the film.
⚗️
Ethics and Power
The film juxtaposes scientific achievement with moral risk, showing how the discovery of atomic energy promises progress while threatening destruction. It questions whether knowledge should be pursued without considering consequences, especially under wartime pressure.
🧭
War and Technology
A portrait of how global conflict accelerates science, funding, and collaboration across institutions and nations. The Manhattan Project is depicted as a massive, secret assembly of physicists, engineers, and politicians driven by urgent wartime needs.
💔
Human Cost
Personal losses underscore the broader consequences of weaponization. The death of Cochran and the news of casualties highlight the individual pain behind strategic decisions, reminding that war's outcomes reverberate through families and communities.

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In a world teetering on the edge of unprecedented scientific triumph and existential dread, the film opens with a stark, newsreel‑style glimpse into a future where the very fabric of humanity is at stake. The atmosphere is heavy with the urgency of wartime innovation, yet it is softened by the quiet reverence of scholars who understand that each breakthrough carries a weight far beyond the laboratory. The visual palette shifts between the austere corridors of research facilities and the bustling energy of a nation mobilised for conflict, creating a persistent undercurrent of tension that never fully resolves.
Amid this charged backdrop, Dr. J. Robert Oppenheimer emerges as a voice of both awe and warning, guiding a cadre of brilliant minds grappling with the promise of atomic energy. Matt Cochran works alongside Dr. Enrico Fermi and Dr. Marré, their collaborations flickering between moments of camaraderie and the relentless pressure of a race against time. The presence of Albert Einstein adds a layer of historical gravitas, reminding viewers that even the greatest intellects are caught in the currents of political necessity. The scientists’ dialogue is laced with a blend of hopeful idealism and sober contemplation, hinting at the moral labyrinth they are about to navigate.
Oversight comes from the military and the highest offices of the United States. President Franklin D. Roosevelt authorises a massive funding effort, positioning the project as a national imperative. Lieutenant Colonel Jeff Nixon, assigned to the stern and pragmatic General Leslie Groves, becomes the bridge between the world of theory and the reality of defense logistics. Their interactions convey a tone of disciplined urgency, where every decision is measured against both strategic advantage and the growing awareness of potential consequence. As the narrative deepens, President Harry S. Truman steps into the picture, embodying the continuation of a vision that now teeters between salvation and devastation. The film sustains a lingering sense of curiosity, inviting the audience to ponder the fragile balance between scientific brilliance and the shadows it may cast over the future.
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