‘Heart of the Beast’ Cast Guide, Meet Brad Pitt, J.K. Simmons and Anna Lambe (With Photos)

Paramount Pictures is preparing to send audiences into the Alaskan wilderness with ‘Heart of the Beast,’ a survival thriller built around the bond between a soldier and his dog. After a harrowing plane crash, Special Forces officer James Belmont and his combat dog Odin find themselves stranded deep in the Alaskan wilderness and forced into a brutal fight for survival against the elements. The film is directed by David Ayer from a script by Cameron Alexander, and it arrives with a small but heavyweight cast carrying the story.

Below is a closer look at the principal cast of ‘Heart of the Beast,’ along with the background each actor brings to this survival drama. The film pairs a movie star known for physical, character driven roles with a veteran character actor and a rising talent from Canadian television, giving the project a mix of star power and credibility.

Brad Pitt

Brad Pitt stars as James Belmont in ‘Heart of the Beast,’ and he also serves as a producer on the film. Pitt joined the project in January 2025, producing through his banner Plan B Entertainment alongside Ayer, Damien Chazelle, and Olivia Hamilton. His casting came after the project had been in development for some time, with the screenplay itself tracing back years before cameras rolled.

Production on the project began in March 2024 when Ayer joined, working from a script that had previously appeared on a 2017 list of notable unproduced screenplays. Principal photography took place from March to May 2025 in Queenstown, New Zealand. That stretch of filming placed Pitt on location for an extended physical shoot built around wilderness survival sequences.

Heart of the Beast follows Belmont and Odin after they become stranded in the Alaskan wilderness following a devastating plane crash, with the pair forced to battle harsh conditions and other dangers as the film explores the bond between a soldier and his loyal canine companion. Pitt has already appeared at a screening of the film, where the survival thriller was shown ahead of its wide release. Odin, the dog at the center of the story, is played on screen by a performing dog credited as Uber, according to production records for the film.

The film has reportedly been test screened multiple times in recent months to good reviews, a sign that early industry reaction to Pitt’s performance and the survival story has been positive. ‘Heart of the Beast’ carries a PG-13 rating and is described as an adventure and thriller with elements of mystery, action, and drama. That rating points to a film that leans into peril and physical danger without pushing into harder territory.

J.K. Simmons

J.K. Simmons joined the cast in February 2025, following Pitt’s addition to the project the month before. He is credited in coverage of the film as an Oscar winning actor, underscoring the level of experience surrounding Pitt in the central cast. His involvement was confirmed before Anna Lambe’s casting was finalized, making him the second major name attached to the survival thriller.

Simmons is listed among the film’s principal actors on the project’s official cast and crew records, alongside Pitt and Lambe. Specific plot details about his character have not been widely detailed in the reporting gathered here, though his presence rounds out a small ensemble built around the central man and dog story. He appears in cast listings for the film’s September 2026 theatrical release alongside the rest of the principal players.

Coverage of the production notes that Simmons and Lambe join the cast in what is described as an adventure thriller, with director Ayer leaning into a grittier tone for the frozen setting. That description places Simmons within a film built more around atmosphere and endurance than around ensemble dialogue scenes, consistent with the survival premise at the story’s core.

Anna Lambe

Anna Lambe is set to co-star alongside Brad Pitt in ‘Heart of the Beast,’ joining previously announced cast members Pitt and Simmons in David Ayer’s feature. That casting news was first reported by <a href=”https://imdb.com/news/ni65206831″>The Hollywood Reporter</a>, which noted at the time that details of Lambe’s role remained under wraps. Integral Artists, the talent agency representing Lambe, announced her casting on March 28.

Lambe is an Inuk actress from Nunavut who had recently taken on the lead role as Siaja in the first season of the Netflix, APTN, and CBC comedy ‘North of North,’ which is also set in Nunavut. She is known more broadly for her work in ‘The Grizzlies,’ ‘Trickster,’ and ‘North of North.’ Lambe made her film debut as Spring in the 2018 film ‘The Grizzlies,’ which is based on a true story and was shot in Iqaluit, her hometown, earning her a nomination for the Canadian Screen Award for Best Supporting Actress.

In 2020 she had a supporting role as Sarah in the television series ‘Trickster,’ which brought her a further Canadian Screen Award nomination in 2021 for Best Supporting Actress in a Drama Series. She has also appeared in HBO’s ‘True Detective, Night Country.’ That run of credits made her a natural addition to a cast built around Pitt and Simmons, giving ‘Heart of the Beast’ a rising actress with a track record in acclaimed, character driven work.

‘Heart of the Beast’ is distributed by Paramount Pictures and is scheduled for release in the United States on September 25, with an earlier release in Franklin on September 16. With Pitt, Simmons, and Lambe now set in their roles, the wilderness survival story is positioned as one of the more physically demanding releases on the fall schedule. Readers who plan to catch James Belmont and Odin’s fight for survival on the big screen are welcome to share which member of this cast they are most looking forward to watching brave the Alaskan wilderness.