Cillian Murphy

(J. Robert Oppenheimer)

Emily Blunt

(Kitty Oppenheimer)

Robert Downey

(Lewis Strauss)

Matt Damon

(Leslie Groves)

Rami Malek

(David Hill)

Florence Pugh

(Jean Tatlock)

Benny Safdie

(Edward Teller)

Michael Angarano

(Robert Serber)

Josh Hartnett

(Ernest Lawrence)

Kenneth Branagh

(Niels Bohr)

Casey Affleck

(Boris Pash)

Dane DeHaan

(Kenneth Nichols)

Dylan Arnold

(Frank Oppenheimer)

David Krumholtz

(Isidor Rabi)

Alden Ehrenreich

(Senate Aide)

Matthew Modine

(Vannevar Bush)

Josh Peck

(Kenneth Bainbridge)