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● Movie Guide · Last updated May 18, 2026

Oppenheimer: Plot, Cast, Ending & Where to Watch

2023 · United Kingdom · Drama, History · 3h 01m · Dutch

Oppenheimer is a 2023 United Kingdom drama film directed by Christopher Nolan. This guide covers the plot, full cast, an overview of the ending, where to watch, and similar films you might want next.

Read Ending Explained → Movies Like Oppenheimer Where to Watch
DramaHistoryEditorial pick
Original Title
Oppenheimer
Director
Christopher Nolan
Writers
Christopher Nolan
Country
United Kingdom
Runtime
3h 01m
Release
Jul 19, 2023
§ 01 Plot · 6 min read

Oppenheimer Plot Summary

Oppenheimer is a 2023 epic biographical thriller film written, co-produced, and directed by Christopher Nolan. It follows the life of J. Robert Oppenheimer, the British theoretical physicist who helped develop the first nuclear weapons during World War II. Based on the 2005 biography American Prometheus by Kai Bird and Martin J. Sherwin, the film dramatizes Oppenheimer's studies, his direction of the Los Alamos Laboratory and his 1954 security hearing. Cillian Murphy stars as Oppenheimer, alongside Robert Downey Jr. as the United States Atomic Energy Commission member Lewis Strauss. The ensemble supporting cast includes Emily Blunt, Matt Damon, Florence Pugh, Josh Hartnett, Casey Affleck, Rami Malek, and Kenneth Branagh.

● Quick takeaway

Oppenheimer (2023) is a United Kingdom drama film, directed by Christopher Nolan, running 181 minutes. The story of J. Robert Oppenheimer's role in the development of the atomic bomb during World War II. Stars Cillian Murphy and Emily Blunt. Critical reception: IMDb 8.2/10, Rotten Tomatoes 93%, Metacritic 90/100. Tagline: "The world forever changes.." This guide covers the plot, full cast, ending, and where to watch.

§ 02 Cast · 6 roles

Cast and Characters

Cillian Murphy headshot
as J. Robert Oppenheimer
Murphy holds the camera for almost every minute of the color thread, working in a register Nolan has elsewhere called "interior weather" — eyes that flicker between calculation and dread, a body that learns to flinch on cue at the sound of feet on bleachers. The performance is a sustained act of attention to a man who has stopped trusting his own face.
Emily Blunt headshot
Emily Blunt
as Kitty Oppenheimer
Blunt's Kitty is the film's anti-confessional conscience: a biologist who keeps a martini close, drinks through Los Alamos, dares Roger Robb to break her on the stand, and refuses Edward Teller's handshake at a postwar ceremony. The character's loyalty to her husband takes the form of a sustained refusal to grant the apparatus the moral closure it is asking for.
Matt Damon headshot
Matt Damon
as Leslie Groves
Damon plays the Manhattan Project's military director as a man who has decided, on first sight of Oppenheimer, that this is the temperament the country will have to bet on. The role is mostly negotiation — over compartmentalisation, over Kitty's drinking, over the date of Trinity — and Damon plays it as exasperated competence forced into a working partnership with genius.
Robert Downey Jr. headshot
Robert Downey Jr.
as Lewis Strauss
Downey carries the entire black-and-white Fusion thread, building Strauss as a man whose grievances are administered through the bureaucratic forms of the Atomic Energy Commission. The performance is almost entirely close work — small eye-shifts, voice pulled half a register tighter than it needs to be — and it is the late-arriving engine that turns the 1959 Senate vote into the film's first verdict.
Florence Pugh headshot
as Jean Tatlock
Pugh's Tatlock is a Berkeley psychiatrist and Communist Party member whose intermittent affair with Oppenheimer becomes, after her death in 1944, the AEC's most efficient cross-examination weapon. The screen time is brief and the function is structural: Tatlock haunts the 1954 hearing the way the apple haunts the early Cambridge scenes, as a piece of swallowed knowledge that the body keeps producing.
Josh Hartnett headshot
Josh Hartnett
as Ernest Lawrence
Hartnett's Lawrence is the Berkeley experimentalist who builds the cyclotron, recruits Oppenheimer into the political work the bomb will require, and then, in the postwar period, watches with confused dismay as his friend testifies against the hydrogen bomb. He is the film's portrait of the scientist who could not finally distinguish ambition from patriotism, and who therefore could not follow Oppenheimer into penance.
§ 03 · Spoiler Zone · Read with care

Ending Overview

How does Oppenheimer end? Our spoiler-aware breakdown walks through the final act beat by beat — including the choices, motivations, and ambiguous final shot that viewers most often debate.

Read full Ending Explained →
§ 04 Watch · Updated May 18

Where to Watch Oppenheimer

Availability may vary by region and change over time.

A
Amazon Video
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Apple TV Store
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G
Google Play Movies
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Y
YouTube
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§ 06

Frequently Asked

What is Oppenheimer about?

The story of J.

Where can I watch Oppenheimer?

See the Where to Watch section below for the current streaming, rental, and purchase options in your region.