Cillian Murphy’s Ungodly Weight Loss for Oppenheimer and 8 Other Cast Members in $445M Christopher Nolan Movie Who Went to Extreme Lengths for the Atomic Classic

Cillian Murphy's Ungodly Weight Loss for Oppenheimer and 8 Other Cast Members in $445M Christopher Nolan Movie Who Went to Extreme Lengths for the Atomic Classic
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Paycheck is not always on the priority list for many A-listers, as for several actors, the chance of working with their favorite filmmaker often prevails over their desire of wanting a hefty amount. The same can be said for several A-listers, including Cillian Murphy and Robert Downey Jr, who agreed to work alongside Nolan, even though many of them had substantially lesser screen time.


But this didn’t stop them from bringing their absolute A-game moving into the 3-hour long period drama, including the lead actor, Cillian Murphy, who went under extreme transformation for the role.

Also read: “I’m being presumptuous myself”: Al Pacino Believes Christopher Nolan Hates Him for a Strange Reason After Working Together in $114M Movie

Christopher Nolan is infamous for taking multiple shots
Christopher Nolan

9 Prominent Stars Who Brought Their A-Game in Christopher Nolan’s Oppenheimer

Cillian Murphy:

Being at the forefront of the 3-hour-long biopic, Cillian Murphy arguably delivers one of his best performances to date on the big screen, bringing Nolan’s vision to life. But one of the more impressive feats was the transformation he had undergone for the role, losing a substantial amount of weight in order to replicate J. Robert Oppenheimer’s physique. Although the exact number isn’t known, according to his costars, Cillian Murphy refused dinner invitations every night during the entire production, following his commitment to the job.

Cillian Murphy in and as Oppenheimer
Cillian Murphy in and as Oppenheimer

Robert Downey Jr:

Witnessing Robert Downey Jr. as something different other than Tony Stark was a breath of fresh air for the fans, and like Cillian Murphy, the Iron Man Star doesn’t pull punches and delivers his absolute best. Playing the role of Lewis Strauss in the film, the actor has delivered one of his best performances since playing Kirk Lazarus in Tropic Thunder. And fans are assured like his role in Tropic Thunder, his work in Oppenheimer too might land him an Oscar nomination for Best Supporting Actor.

Robert Downey Jr. in Oppenheimer
Robert Downey Jr. as Lewis Strauss

Matt Damon:

Although reports claimed Damon was reportedly taking a break from acting after Air as a negotiation with his wife during a couples therapy session, the chance of working with Nolan was too much to resist. Playing the Manhattan Project director, General Leslie Groves, the actor too doesn’t disappoint in bringing his charm to the character, and his chemistry with Cillian Murphy’s Oppenheimer was enticing to watch.

Matt Damon as Leslie Groves
Matt Damon as Leslie Groves

Florence Pugh:

As her first partnership with Christopher Nolan, Florence Pugh plays the role of Jean Tatlock in the movie, who is essential to the emotional core of the film. And like her co-stars, Pugh does an exceptional job with the material she is given, making every single scene she is involved in memorable.

Florence Pugh as Jean Tatlock
Florence Pugh as Jean Tatlock

Emily Blunt:

it didn’t take a lot of convincing on Christopher Nolan’s part to bring Emily Blunt on board, as reports claimed, after meeting the director in Los Angeles, she instantly accepted the role. In the movie, Blunt plays the role of  Katherine Puening, who ties the knot with Oppenheimer, and she also delivers one of the most impactful scenes in the movie.

Also read: After Christopher Nolan Denied Him The Dark Knight 4, Christian Bale’s Co-Star Also Lost Star-Lord Role to Chris Pratt

Emily Blunt as Katherine Puening
Emily Blunt as Katherine Puening

Tom Conti:

Throughout his brief scenes portraying the theoretical physicist Albert Einstein, Tom Conti partakes in some of the most gut-wrenching scenes in the movie. And the ending scene, involving the duo of him and Cillian Murphy’s Oppenheimer, it’s not a hot take to say that it will go down as one of the most iconic endings to a Christopher Nolan movie.

Tom Conti as Albert Einstein in Oppenheimer
Tom Conti as Albert Einstein

Rami Malek:

Following the long list of celebrity brief appearances in the movie, unlike many big-budget Hollywood flicks, every brief moment from these actors have a purpose, including Rami Malek’s David Hill. Although in total, the actor appears for less than 10 minutes in the movie, it doesn’t stop him from delivering his best, as his final scene ultimately decides Lewis Strauss’ fate.

Rami Malek as David Hill

Benny Safdie:

After doing a reference check with director Paul Thomas Anderson, Christopher Nolan picked Benny Safdie to play the father of the hydrogen bomb, Edward Teller. But besides doing a great job bringing the controversial figure to life, the actor was also asked by Nolan to not pluck his eyebrows for months for the movie. “I am proud to say that it’s all my eyebrows,” Safdie stated.

Benny Safdie as Edward Teller
Benny Safdie as Edward Teller

Kenneth Branagh:

It appears Kenneth Branagh is becoming the next constant in Christopher Nolan-led projects, as Oppenheimer marked the third collaboration between the two. Despite having a substantially lesser presence in the film, the actor shines as Niels Bohr in the movie.

Also read: “He hasn’t offered me a film”: Christopher Nolan May Never Ask Al Pacino to Be in His Movie Again and He Has Good Reasons to Do So

Kenneth Branagh as Niels Bohr in Oppenheimer
Kenneth Branagh as Niels Bohr

Apart from these prominent stars, there are a plethora of other A-listers from the heavily star-studded cast, who doesn’t disappoint. But apart from everyone’s brilliance, Nolan deserves the utmost praise for his direction, as he succeeded in bringing the Cillian Murphy-led 3-hour period drama into the mainstream spotlight, which might not have been possible by any other filmmaker.


Oppenheimer is currently in theatres.


Written by Santanu Roy

Articles Published: 1609

Santanu Roy is a film enthusiast with a deep love for the medium of animation while also being obsessed with The Everly Brothers, Billy Joel, and The Platters. Having expertise in everything related to Batman, Santanu spends most of his time watching and learning films, with Martin Scorsese and Park Chan-wook being his personal favorites. Apart from pursuing a degree in animation, he also possesses a deep fondness for narrative-driven games and is currently a writer at Fandomwire with over 1500 articles.