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

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.

The Barbie poster featuring Barbie and Ken sitting on the letter 'B'
Warner Bros. Pictures, Universal Pictures

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.

The cast and director of Barbie
Jon Kopaloff / Getty Images

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.

A closeup of Cillian Murphy as Oppenheimer with a cigarette hanging from his mouth
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.

Robert Downey Jr. in a suit and tie sitting on a couch
Universal Pictures

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.

Oppenheimer testifying
Universal Pictures

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

1.Emily Blunt

Emily Blunt plays Katherine

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

Taylor Hill / Getty Images

2.Matt Damon

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

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

Theo Wargo / Getty Images for Tribeca Festival

3.Robert Downey Jr.

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

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

Steve Granitz / FilmMagic,

4.Florence Pugh

Florence Pugh plays Jean Tatlock, a physician and psychiatrist.

Florence Pugh plays Jean Tatlock, a physician and psychiatrist.

Taylor Hill / Getty Images

5.Josh Hartnett

Josh Hartnett plays Ernest Lawrence, a physicist.

Josh Hartnett plays Ernest Lawrence, a physicist.

Jeff Spicer / Jeff Spicer / Getty Images

6.Rami Malek

Rami Malek plays David Hill. 

Rami Malek plays David Hill.

Samir Hussein / WireImage

7.Alden Ehrenreich

Alden Ehrenreich's character is not yet known.

Alden Ehrenreich's character is not yet known.

Araya Doheny / FilmMagic

8.Benny Safdie

Benny Safdie plays Edward Teller, a physicist.

Benny Safdie plays Edward Teller, a physicist.

Dimitrios Kambouris / Getty Images

9.Jack Quaid

Jack Quaid plays Richard Feynman, a physicist.

Jack Quaid plays Richard Feynman, a physicist.

Dominik Bindl / FilmMagic

10.Michael Angarano

Michael Angarano plays Robert Serber, a physicist.

Michael Angarano plays Robert Serber, a physicist.

Jon Kopaloff / Getty Images

11.Josh Peck

Josh Peck plays Kenneth Bainbridge, a physicist.

Josh Peck plays Kenneth Bainbridge, a physicist.

Tommaso Boddi / Getty Images

12.Kenneth Branagh

Kenneth Branagh plays Niels Bohr, a physicist and philosopher.

Kenneth Branagh plays Niels Bohr, a physicist and philosopher.

Angela Weiss / AFP via Getty Images

13.Alex Wolff

Alex Wolff's character is not yet known.

Alex Wolff's character is not yet known.

Jeremy Chan / Getty Images

14.Jason Clarke

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

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

Valerie Macon / AFP via Getty Images

15.Tony Goldwyn

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

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

Dominik Bindl / WireImage

16.Casey Affleck

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

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

Lionel Hahn / Getty Images

17.Gary Oldman

Gary Oldman plays President Harry S. Truman.

Gary Oldman plays President Harry S. Truman.

Michael Tullberg / Getty Images

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.