Other Mommy (2026): Release Date, Cast, Story & Trailer for Jessica Chastain’s New Horror Movie

Universal Pictures has unveiled the official trailer for Other Mommy, introducing one of the most unsettling horror films arriving this Halloween season. Starring Jessica Chastain in a chilling dual role, the supernatural thriller comes from director Rob Savage, with James Wan producing through Atomic Monster alongside Blumhouse Productions.

Based on Josh Malerman’s bestselling novel Incidents Around the House, the film follows a young girl haunted by an entity that looks exactly like her mother.

Other Mommy opens exclusively in theaters on October 9, 2026.

Other Mommy Trailer Introduces a Sinister New Horror Icon

The first trailer wastes no time creating an atmosphere of creeping dread.

Young Bela begins interacting with a mysterious figure known only as “Other Mommy,” a terrifying presence that perfectly resembles her real mother. What starts as strange encounters inside the family home quickly evolves into a nightmare as the entity grows more manipulative and dangerous.

The trailer relies on psychological tension, unsettling imagery, and quiet moments of terror rather than constant jump scares, teasing a horror experience built around fear, paranoia, and emotional trauma.

Jessica Chastain’s performance in two very different roles immediately stands out as one of the film’s biggest draws.

What Is Other Mommy About?

Adapted from Josh Malerman’s acclaimed novel Incidents Around the House, Other Mommy centers on Bela, a young girl whose home is invaded by a supernatural entity.

The creature takes the exact appearance of Bela’s mother and slowly attempts to earn the child’s trust while manipulating the family from within. As the haunting intensifies, Bela and her parents must confront a force that blurs the line between love and horror.

Rather than relying solely on supernatural scares, the story explores fear through the eyes of a child, making the emotional stakes as important as the terrifying mystery.

Jessica Chastain Leads the Cast

Academy Award winner Jessica Chastain headlines the film in a demanding dual performance.

Main Cast

• Jessica Chastain as Ursula and the terrifying “Other Mommy”
• Jay Duplass as Russ
• Arabella Olivia Clark as Bela
• Dichen Lachman
• Arian Moayed
• Karen Allen as Grandma Ruth
• Sean Kaufman
• Adam Silver
• Rosie Anne O’Gorman

From James Wan, Rob Savage, and the World of Blumhouse

Other Mommy brings together several of modern horror’s most recognizable creative voices.

The film is directed by Rob Savage, whose previous credits include Host and The Boogeyman. The screenplay is written by Nathan Elston, adapting Josh Malerman’s novel for the screen.

Producer James Wan, whose work includes Saw, Insidious, and The Conjuring franchises, reunites with Blumhouse Productions and Atomic Monster, continuing a partnership that has delivered many of the genre’s biggest theatrical hits.

Is Other Mommy Based on a Book?

Yes. Other Mommy is based on Josh Malerman’s 2024 novel Incidents Around the House.

Malerman is best known for writing Bird Box, another bestselling horror novel that was successfully adapted for the screen. Fans of psychological horror and supernatural suspense will likely recognize similar themes of fear, isolation, and unseen danger.

Other Mommy Release Date

Other Mommy will be released exclusively in U.S. theaters on October 9, 2026, by Universal Pictures.

Its October release places it at the heart of the Halloween movie season, where horror audiences traditionally look for major theatrical releases.

Why Other Mommy Could Be One of 2026’s Scariest Movies

Few horror films combine this level of talent both in front of and behind the camera.

Jessica Chastain’s dual performance, Rob Savage’s knack for building sustained tension, James Wan’s influence as a producer, and Josh Malerman’s acclaimed source material give Other Mommy a strong foundation before audiences even step into theaters.

The trailer also suggests a more psychological approach to horror, focusing on childhood fears, family relationships, and identity rather than relying solely on conventional scares.

The first trailer positions Other Mommy as one of the most intriguing horror releases of 2026.

With an acclaimed cast, an experienced creative team, and a haunting premise built around a child confronting an entity wearing her mother’s face, the film has the potential to become a standout addition to this year’s Halloween season.

Frequently Asked Questions

When does Other Mommy release?

Other Mommy opens exclusively in theaters on October 9, 2026.

Is Other Mommy based on a book?

Yes. The film adapts Josh Malerman’s bestselling novel Incidents Around the House.

Who stars in Other Mommy?

The cast includes Jessica Chastain, Jay Duplass, Arabella Olivia Clark, Dichen Lachman, Arian Moayed, and Karen Allen.

Who directed Other Mommy?

The film is directed by Rob Savage and produced by James Wan through Atomic Monster alongside Blumhouse Productions.

Where can I watch Other Mommy?

Other Mommy will be released exclusively in theaters on October 9, 2026.