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Oppenheimer: all about the startling true story and Christopher Nolan's unbelievable A-List cast

Oppenheimer is out in theaters July 21, and it has a star-studded A-List cast you won't believe

Robert Downey Jr., Christopher Nolan, Emily Blunt, Cillian Murphy, Florence Pugh and Matt Damon attend the London Photocall for Universal Pictures' "Oppenheimer" at Trafalgar Square on July 12, 2023 in London, England
Beatriz Colon
Beatriz Colon - New York
Online News WriterNew York
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While Christopher Nolan's highly-anticipated film Oppenheimer isn't quite putting out the mind-blowing PR that fellow summer blockbuster Barbie is, its packed, A-List celebrity cast more than makes up for it.

Both Oppenheimer and Greta Gerwig's Barbie will (finally) premiere in theaters July 21, and two weeks before the official release, AMC Theaters, the largest chain of movie theaters in the US, reported that more than 20,000 of their AMC Stubs members have already bought double feature tickets.

Now, let us introduce you to the real Oppenheimer, and all of the mega-stars telling his story.

MORE: Cillian Murphy's net worth revealed

What is Oppenheimer about? 

Oppenheimer is based on the Pulitzer Prize-winning biography American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer, authored by Kai Bird and Martin J. Sherwin over a period of twenty-five years, which was released in 2005.

It details the life of physicist J. Robert Oppenheimer (1904-1967), his efforts to build the atomic bomb during World War II, and his inner turmoil as he faced "the moral consequences of scientific progress."

Physicist J. Robert Oppenheimer, Manhattan project, atomic bomb© Getty
Oppenheimer died aged 62

Who was the real Oppenheimer?

Oppenheimer was born Julius Robert Oppenheimer in New York City in 1904, and today is considered "the father of the atomic bomb."

MORE: Cillian Murphy's home life with his wife and children

He was the director of the Los Alamos Laboratory during World War II, and is best known for his role in the Manhattan Project, a US government-led research project supported by the UK and Canada which ran from 1942 to 1945 that produced the world's first atomic bombs.

Christopher Nolan, Cillian Murphy, Emily Blunt, Robert Downey Jr, Florence Pugh and Matt Damon attend a photocall for "Oppenheimer" at Trafalgar Square on July 12, 2023 in London, England© Getty
The core cast of Oppenheimer with their director in London

Who are the stars of Christopher Nolan's Oppenheimer?

First and foremost, Peaky Blinders actor Cillian Murphy stars as the titular character. As the cast spoke to People about their time filming in the middle of the New Mexico desert, his co-star Emily Blunt recalled their cast dinners, but revealed Cillian would often have to skip them.

"The sheer volume of what he had to take on and shoulder is so monumental," she said, adding: "Of course he didn't want to come and have dinner with us."

Matt Damon, Robert Downey Jr, Cillian Murphy, Emily Blunt and Christopher Nolan attend the "Oppenheimer" premiere at Cinema Le Grand Rex on July 11, 2023 in Paris, France© Getty
Oppenheimer had its global premiere in Paris on July 11

Cillian concurred: "You know that when you have those big roles, that responsibility, you feel it's kind of overwhelming." Luckily for them, filming is now in the past, and much of the cast was recently pictured in a smile-ridden selfie.

The cast of Oppenheimer reunite for a small gathering with John Krasinski© Instagram
The cast recently reunited for a small gathering with John Krasinski

Emily stars as Oppenheimer's wife, Katherine "Kitty" Oppenheimer Vissering, who hailed from Germany and passed away in Panama in 1972. In real life, the couple had two children: Peter Oppenheimer, 82, and Katherine "Toni" Oppenheimer, who died of suicide in 1977 on her 32nd birthday.

Matt Damon stars as Lt. Gen. Leslie Groves, who oversaw the construction of the Pentagon, and was the official director of the Manhattan Project. Robert Downey Jr. plays former United States Secretary of Commerce Lewis Strauss, who served two terms on the U.S. Atomic Energy Commission, and Florence Pugh plays psychiatrist Jean Tatlock, Oppenheimer's young mistress. 

Emily Blunt is Kitty Oppenheimer and Cillian Murphy is J. Robert Oppenheimer in OPPENHEIMER© Melinda Sue Gordon/Universal Pic
Emily as Kitty Oppenheimer and Cillian as J. Robert Oppenheimer in Oppenheimer

Other notable stars in the film are Meg Ryan and Dennis Quaid's son Jack Quaid as theoretical physicist Richard Feynman, Rami Malek as David Hill, Josh Peck as physicist Kenneth Bainbridge, Gary Oldman as the 33rd US President Harry S. Truman, Casey Affleck as military intelligence officer Boris Pash, Alex Wolff as physicist Luis Walter Alvarez, Kenneth Branagh as Danish physicist Neils Bohr, Tony Goldwyn as former National Security Advisor of the United States Gordon Gray, and more, if you can believe it.

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