'Other Mommy' Trailer Drops: Jessica Chastain Returns to Horror with a Sinister Doppelganger

By Hollywood Buzz News | July 21, 2026

After a decade away from the genre, Jessica Chastain is venturing back into horror territory. The trailer for the upcoming film Other Mommy arrived online this morning, and it offers a deeply unsettling glimpse at what director Rob Savage has in store. The two-minute preview positions the movie as a psychological nightmare wrapped in a family tragedy, with Chastain pulling double duty as both a mother and the monstrous entity threatening to replace her.

A Twisted Home Invasion

Other Mommy centers on a young girl named Bela, played by newcomer Arabilla Olivia Clark. The trailer opens with an idyllic suburban household before something goes terribly wrong. According to the film’s official synopsis, a sinister entity has set its sights on the family and is determined to take up residence inside the child. The catch? It needs her permission to enter.

“But first, it needs to persuade her to let it in,” the overview reads, setting up a deeply personal and unnerving premise. The entity doesn’t just haunt the house-it manifests as a body-twisting doppelganger of Ursula, the mother played by Chastain. The trailer shows Chastain’s character contorted in unnatural positions, her face shifting between tenderness and menace, her voice cracking into something inhuman.

This isn’t a typical slasher or jump-scare affair. Savage, known for his innovative found-footage horror Host and the pandemic-era thriller Dashcam, appears to be crafting a slow-burn psychological horror that plays with identity, childhood fear, and the fragility of familial bonds. The trailer’s standout moments include the Other Mommy crawling across ceilings, whispering through walls, and appearing in mirrors where the real Ursula should be.

Reuniting with Horror

Chastain’s return to horror is notable. The Oscar winner previously starred in Mama (2013) and The Disappearance of Eleanor Rigby (2013-14) but has largely avoided the genre since, focusing on dramas and thrillers. Other Mommy marks her first straight horror lead in over a decade, and the trailer suggests she’s fully committed to the physical and emotional demands of the role.

Playing both Ursula and her doppelganger means Chastain must convey warmth and terror sometimes within the same scene. The trailer showcases her ability to switch between protective mother and predatory entity with chilling fluidity. Her performance will be central to whether the film lands as a genuine frightfest or a gripping family drama twisted by dread.

Supporting cast includes Jay Duplass as Russ, also referred to as “Daddo” in the trailer, and Dichen Lachman, Arian Moayed, Karen Allen, Sean Kaufman, and Adam Silver in undisclosed roles. Allen, a genre veteran from National Lampoon’s Vacation and Starman, brings welcome gravitas to what appears to be a small but crucial part.

Familiar Yet Unsettling

The premise of a malevolent entity impersonating a loved one is not new-The Babadook, Hereditary, and The Others all tap into similar veins of domestic horror. But Savage’s trailer suggests a distinct visual language. The doppelganger doesn’t just mimic Ursula; it distorts her, stretching her body into impossible shapes, speaking in a voice that sounds like a broken recording of the real mother.

The child’s perspective is clearly central. The trailer focuses heavily on Bela’s terrified reactions, her small frame dwarfed by hallways and doorways, and the growing suspicion that the woman tucking her in at night may not be her mother at all. This childhood vulnerability-combined with the entity’s need for invitation-hints at a story about trust, boundaries, and the monsters we let into our homes.

Release Date and Expectations

Other Mommy is scheduled for an October 8, 2026 release, putting it squarely in the Halloween corridor. The trailer’s arrival in July gives it a solid three-month runway to build anticipation, though Savage’s previous films have thrived on word-of-mouth rather than massive marketing campaigns.

The film’s runtime has not yet been disclosed, and early critical ratings are not available, meaning audience expectations remain entirely shaped by what the trailer delivers. What’s clear is that Savage is aiming for something deeper than surface-level scares. The combination of a child protagonist, a body-twisting doppelganger, and Chastain’s dual performance suggests a horror movie that wants to unsettle on a psychological level rather than simply shock.

Whether Other Mommy lives up to its promising trailer remains to be seen. But for fans of smart, atmospheric horror-and of Chastain exploring darker territory-this is one to mark on the calendar. The trailer is now streaming online, and it’s likely to haunt viewers long after it ends.

Source: Hollywood Reporter