Name: Oppenheimer
Genre: Biography
Duration: 181 min
Cast: Cillian Murphy, Matt Damon, Robert Downey Jr.

Collider

Who Does Matt Damon Play in 'Oppenheimer'?

This man may have been more important than Oppenheimer in the use of the first atomic bomb.

Image by Annamaria Ward

Oppenheimer is a three-hour epic biopic with a colossal cast, including Cillian Murphy, Robert Downey Jr., and Matt Damon.
Lt. General Leslie Groves played a crucial role in the Manhattan Project, overseeing the construction, development, and deployment of the atomic bomb.
Matt Damon brings his acting prowess to the role of Groves, playing the hard-ass military man and providing a compelling foil to J. Robert Oppenheimer's intellectual scientist.