Jessica Chastain delivers dual doses of maternal warmth and monstrous deformity in the freshly released trailer for Other Mommy, which Universal Pictures and Blumhouse dropped on July 21 ahead of the film's October 9, 2026 theatrical debut. The footage wastes no time plunging viewers into a family's nightmare as a sinister entity mimics Chastain's character with uncanny precision. Early sequences already signal a deeply unsettling blend of domestic drama and visceral body horror that sets this adaptation apart.
In the trailer, Chastain portrays Ursula, a seemingly devoted mother, while also embodying the eerie “Other Mommy,” a paranormal entity invading the family home. Young Bela, played by Arabella Olivia Clark, interacts with the doppelgänger, who cooks pasta and engages in unsettling conversations. One standout moment shows the creature contorted under the kitchen table with spider-like limbs as Bela’s father, Russ portrayed by Jay Duplass, discovers the horrifying sight.
The footage builds dread through intimate family moments that quickly spiral into terror. Bela explains to her real mother that “Other Mommy” lives in their home and is nice, despite clear signs of danger. Smoke rises from a burning pot on the stove as Chastain’s eyes widen unnaturally, heightening the psychological unease. These sequences highlight the entity’s growing influence over the young girl.
Additional scenes emphasize the home invasion theme, with the sinister figure emerging from closets and manipulating relationships. The trailer effectively mixes domestic normalcy with body horror elements, particularly in Chastain’s transformations. Audiences can expect a blend of emotional depth and jump scares that target fears of the familiar turning monstrous.
Watch the first trailer for Other Mommy below:
What is Other Mommy about?
The film is based on the 2024 novel Incidents Around the House by Josh Malerman. It delves into the unsettling experiences of a young family disrupted by a malevolent presence. The story centers on the psychological and supernatural toll this entity takes on its victims.
The official synopsis describes Other Mommy as “a terrifying trip into the darkening world of a young girl, Bela, who forms a relationship with a sinister entity in her home who looks uncannily like her own mother.” This premise draws on themes of trust, identity, and hidden threats within the household. Malerman’s source material, known for its tense atmosphere in works like Bird Box, provides a strong foundation for the adaptation.
The cast features standout performances, with Jessica Chastain leading as Ursula and the entity known as Other Mommy. Arabella Olivia Clark stars as Bela, while Jay Duplass plays Russ, Bela’s father. Supporting roles include Dichen Lachman, Arian Moayed, Karen Allen, Sean Kaufman, and others who round out the family and surrounding characters.
Other Mommy is directed by Rob Savage, known for his work on films like The Boogeyman. The screenplay comes from Nathan Elston, who adapted the story for the screen. James Wan serves as a producer through his Atomic Monster banner, collaborating with Blumhouse Productions.
Chastain’s spider-limbed contortions and tear-streaked pleas to enter Bela’s heart in the Other Mommy trailer signal a horror experience poised to burrow under viewers’ skin long after the credits roll on October 9. Rob Savage’s direction, paired with Nathan Elston’s screenplay from Josh Malerman’s novel, crafts a fresh maternal nightmare that expands the Blumhouse legacy of intimate terrors. This October release looks set to redefine household hauntings with its relentless focus on distorted familial bonds and creeping possession.
