Matt Damon shows off bulging biceps in a gray tee while leaving the set of Oppenheimer in LA

Matt Damon rocks a mustache and shows off bulging biceps in a gray tee as he leaves the set of Oppenheimer in LA

Matt Damon stepped out with a small mustache while leaving the set of his upcoming film Oppenheimer in Los Angeles on Friday.

The actor, 51, gave a gray t-shirt that barely concealed his muscular arms and a pair of black fitted pants.

He walked in a pair of well-worn gray sneakers with an orange symbol on the side.

That’s a wrap! Matt Damon stepped out with a small mustache while leaving the set of his upcoming film Oppenheimer in Los Angeles on Friday

It appeared the Good Will Hunting star might have been going for an incognito look, his baseball cap pulled low over his eyes and dark sunglasses obscuring his face.

He carried a black sweater with him and a big red folder, possibly containing a script, in his hands.

Damon is purportedly playing Leslie Groves Jr. who led the Manhattan Project, the United States’ covert research team dedicated to developing the atomic bomb.

Buff: The actor, 51, gave a gray t-shirt that barely concealed his muscular arms and a pair of black fitted pants.  He walked in a pair of well-worn gray sneakers with an orange symbol on the side

Buff: The actor, 51, gave a gray t-shirt that barely concealed his muscular arms and a pair of black fitted pants. He walked in a pair of well-worn gray sneakers with an orange symbol on the side

Military man: Damon was spotted in full costume, a light brown tie, pants and shirt underneath a long green jacket, earlier this week

Military man: Damon was spotted in full costume, a light brown tie, pants and shirt underneath a long green jacket, earlier this week

The Martian actor is one of many stars with a role in Christopher Nolan’s drama based on the book American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer by Kai Bird and Martin J. Sherwin.

Cillian Murphy of Peaky Blinders fame will play the titular character, and A Quiet Place actress Emily Blunt will play his wife Kitty.

Robert Downey Jr., Florence Pugh, Gary Oldman, Casey Affleck, Kenneth Branagh, Rami Malek and Jason Clarke all have parts in the film plus many more veritable Hollywood pros.

Damon was spotted in full costume, a light brown tie, pants and shirt underneath a long green jacket, earlier this week.

Powerful book: The movie is based on the biography American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer by Kai Bird and Martin J. Sherwin

Powerful book: The movie is based on the biography American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer by Kai Bird and Martin J. Sherwin

Lead role: Cillian Murphy of Peaky Blinders fame will play the titular character

Lead role: Cillian Murphy of Peaky Blinders fame will play the titular character

The movie will follow Oppenheimer’s life while he developed the atomic bomb for the United States government.

His work led to bombs being dropped on Hiroshima and Nagasaki, a devastating attack that killed thousands and put a final exclamation point on the second World War.

After America dropped the bombs, Oppenheimer campaigned for nuclear weapons controls to avert a potential nuclear war with the former Soviet Union.

Oppenheimer died in 1967 from throat cancer after years of smoking cigarettes. He was 62 years old.

The current release date, set by Universal Pictures, is July 21, 2023

Complicated man: It follows Oppenheimer's life while he developed the atomic bomb for the shadowy Manhattan Project during World War II;  Cillian pictured as Oppenheimer

Chainsmoker: Oppenheimer died in 1967 from throat cancer after years of smoking cigarettes.  He was 62 years old

Playing a legend: Oppenheimer is an adaptation of the 2005 book American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer by Kai Bird and Martin J. Sherwin

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