Other Mommy (2026): Cast, Story and Release Details

Prepared by Movies Dock Editorial

Other Mommy follows young Bela as she encounters a sinister presence in her home that resembles her mother. Directed by Rob Savage and written by Nathan Elston, this 2026 supernatural horror film stars Jessica Chastain, Arabella Olivia Clark and Jay Duplass in a dark story of family, identity and fear.

Other Mommy is a 2026 horror film directed by Rob Savage and written by Nathan Elston. Its premise centers on a child, a haunted home and an entity that takes on the unsettling appearance of her mother.

Jessica Chastain leads the cast as Ursula and Other Mommy, alongside Arabella Olivia Clark as Bela and Jay Duplass as Daddo / Russ. The film is produced by Blumhouse Productions, Atomic Monster and Spin a Black Yarn.

Other Mommy movie details

Story without spoilers

Young Bela develops a relationship with a sinister supernatural entity inside her home. The presence looks remarkably like her mother, creating an unsettling situation in which the boundaries between family, identity and danger begin to blur. As Bela is drawn deeper into this increasingly dark world, the house becomes the setting for a frightening confrontation with an evil presence.

What to expect

Other Mommy is presented as a supernatural horror film built around a haunted-house setting, an evil spirit or demon-like entity and a disturbing family-centered premise. The dual role assigned to Jessica Chastain suggests that the resemblance between Bela’s mother and the threatening presence is central to the story. The film is also based on a novel or book, according to its supplied keywords.

Cast and creative team

Jessica Chastain plays Ursula / Other Mommy, with Arabella Olivia Clark as Bela and Jay Duplass as Daddo / Russ. The supporting cast includes Dichen Lachman, Arian Moayed as Uncle Frank, Karen Allen as Grandma Ruth, Sean Kaufman, Adam Silver, Carrie Dimaculangan as Callie and Travis Nelson as Tony. Rob Savage directs from a screenplay by Nathan Elston.

• Jessica Chastain as Ursula / Other Mommy
• Arabella Olivia Clark as Bela
• Jay Duplass as Daddo / Russ
• Dichen Lachman
• Arian Moayed as Uncle Frank
• Karen Allen as Grandma Ruth
• Sean Kaufman
• Adam Silver
• Carrie Dimaculangan as Callie
• Travis Nelson as Tony

Release and production context

Other Mommy is listed as a 2026 release with a release date of October 7, 2026. It has a runtime of 1 hour and 33 minutes, is classified as Horror, and is listed as Released. The film is from the United States of America and is in English. Its production companies are Blumhouse Productions, Atomic Monster and Spin a Black Yarn.

Production companies: Blumhouse Productions, Atomic Monster, Spin a Black Yarn

Other Mommy official trailer

Watch the official trailer on YouTube

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With its child-centered premise, supernatural threat and mother-like entity, Other Mommy is positioned as a compact horror film focused on fear within the home and family. Its central casting concept gives the story a clear identity without revealing how Bela’s encounter develops.

Film data:
TMDB · IMDb