The "Oppenheimer" Cast Is So Star-Studded, You Might Not Have Known These 17 Actors Are In The Movie

Oppenheimer heads to theaters on July 21, and the cast is full of familiar faces.

July 21 is set to be a major day for film this year. That's because two highly anticipated movies with star-studded casts are dropping on the same day: Barbie and Oppenheimer.

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Most moviegoers know a thing or two about Barbie by now. Hype for the movie is reaching a fever pitch, with the cast jetting across the globe to promote the film at events, on talk shows, and in magazine interviews.

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The buzz for Oppenheimer is high too, but the film doesn't seem to be pumping out the same level of publicity as Barbie. Come to think of it, much of the promo so far for the film has focused on Cillian Murphy, who plays the title character, J. Robert Oppenheimer.

Universal Pictures

The limited publicity, for now at least, is a bit surprising considering how many well-known actors — like Emily Blunt, Matt Damon, and Robert Downey Jr. — are appearing alongside Cillian in the film, which chronicles the real-life story of Oppenheimer and a group of scientists who created an atomic bomb during World War II.

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It's not all that shocking that the film is filled with familiar faces. The movie is directed by Christopher Nolan, who routinely fills his films, including The Dark Knight, Inception, and Tenet, with many recognizable names.

Universal Pictures

So, having now rambled enough, here are 17 actors you can expect to see in Oppenheimer:

1. Emily Blunt

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Emily Blunt plays Katherine "Kitty" Oppenheimer, the wife of J. Robert Oppenheimer.

2. Matt Damon

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Matt Damon plays Leslie Groves, director of the Manhattan Project, which was an undertaking to develop the atomic bomb.

3. Robert Downey Jr.

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Robert Downey Jr. plays Lewis Strauss, who served on the US Atomic Energy Commission.

4. Florence Pugh

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Florence Pugh plays Jean Tatlock, a physician and psychiatrist.

5. Josh Hartnett

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Josh Hartnett plays Ernest Lawrence, a physicist.

6. Rami Malek

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Rami Malek plays David Hill. 

7. Alden Ehrenreich

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Alden Ehrenreich's character is not yet known.

8. Benny Safdie

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Benny Safdie plays Edward Teller, a physicist.

9. Jack Quaid

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Jack Quaid plays Richard Feynman, a physicist.

10. Michael Angarano

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Michael Angarano plays Robert Serber, a physicist.

11. Josh Peck

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Josh Peck plays Kenneth Bainbridge, a physicist.

12. Kenneth Branagh

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Kenneth Branagh plays Niels Bohr, a physicist and philosopher.

13. Alex Wolff

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Alex Wolff's character is not yet known.

14. Jason Clarke

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Jason Clarke plays Robert Robb, an attorney and special counsel.

15. Tony Goldwyn

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Tony Goldwyn plays Gordon Gray, an attorney and government official.

16. Casey Affleck

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Casey Affleck plays Boris Pash, a US Army intelligence officer.

17. Gary Oldman

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Gary Oldman plays President Harry S. Truman.

But that's not all. Dane DeHaan, Gustaf Skarsgård, James D'Arcy, Matthew Modine, David Krumholtz, and so many other actors also appear in the film.