Jessica Chastain Battles a Sinister Doppelgänger in the First Trailer for Other Mommy

Jessica Chastain stars in dual roles in Other Mommy, Rob Savage’s chilling adaptation of Josh Malerman’s Incidents Around the House.

Jessica Chastain Faces a Sinister Doppelgänger in the Chilling First Trailer for Other Mommy

One of the year’s most talked-about horror trailers has finally arrived.

Universal Pictures has released the first trailer and poster for Other Mommy, the upcoming supernatural horror film from director Rob Savage, and early reactions suggest this could become one of the fall’s biggest genre releases. Following a weekend filled with online discussion, the film immediately became a hot topic among horror fans eager to see Savage return to psychological terror.

Scheduled to arrive in theaters on October 9, Other Mommy adapts Josh Malerman’s New York Times bestselling novel Incidents Around the House into what looks like an unsettling story of family, fear, and an entity that wears a familiar face.

Academy Award winner Jessica Chastain leads the cast in dual roles, portraying both Bela’s loving mother and the terrifying “Other Mommy,” a supernatural manifestation that slowly infiltrates a family’s life. The first trailer wastes little time establishing its nightmare premise, centering on young Bela as she develops an increasingly disturbing relationship with an entity that looks exactly like her mother but behaves in ways that become progressively more sinister.

The concept taps into one of horror’s oldest and most enduring fears: the idea that someone you love may no longer be who they appear to be.

Joining Chastain are Jay Duplass as Bela’s father, Daddo, and Arabella Olivia Clark as Bela herself. The supporting cast includes Severance star Dichen Lachman, Succession standout Arian Moayed, and screen legend Karen Allen.

Behind the camera, Other Mommy boasts an impressive creative team.

The film is directed by Rob Savage, whose breakout pandemic thriller Host became one of the most celebrated horror films of 2020. Savage later helmed The Boogeyman, further cementing himself as one of horror’s rising directors. The screenplay comes from WGA Award winner Nathan Elston, known for his work on HBO’s Emmy-winning Succession.

The adaptation is based on Josh Malerman’s acclaimed novel Incidents Around the House. Malerman previously introduced audiences to another unforgettable horror phenomenon with Bird Box, and his latest story appears poised to deliver another deeply unsettling experience.

Producing the film is horror heavyweight James Wan through Blumhouse Atomic Monster. Wan’s résumé includes the Saw, Insidious, and The Conjuring franchises, making Other Mommy another high-profile collaboration under one of horror’s most successful banners.

While the trailer keeps many of its biggest scares hidden, it effectively leans into psychological dread rather than revealing too much. The imagery evokes classic changeling folklore and modern doppelgänger horror, exploring the terrifying possibility that something evil can imitate the people we trust most.

Films like Jordan Peele’s Us demonstrated just how effective identity horror can be when grounded in emotional family dynamics, and Other Mommy appears ready to explore similar territory through its own supernatural lens.

With its acclaimed source material, accomplished cast, proven horror filmmakers, and one of the strongest trailers released this summer, Other Mommy is quickly becoming one of Horror Movies Uncut’s most anticipated horror releases of the fall.

And with Fantastic Fest right around the corner, don’t be surprised if Other Mommy becomes one of the festival’s most talked-about screenings before haunting theaters nationwide on October 9.