First Trailer for Jessica Chastain Horror Film 'Other Mommy' Arrives Exclusively in Theaters
Horror fans are getting their first look at Other Mommy, the upcoming supernatural thriller starring Jessica Chastain, as Universal Pictures attached the debut trailer to theatrical screenings of Christopher Nolan's The Odyssey this weekend. The trailer, which premiered exclusively in theaters starting July 17, 2026, will make its way online soon, but early reactions from audiences have already sparked significant buzz.
Directed by Rob Savage (Host, The Boogeyman), Other Mommy is an adaptation of Josh Malerman's horror novel Incidents Around the House. The film follows eight-year-old Bela (played by newcomer Arabella Olivia Clark), who is haunted by a sinister entity she calls "Other Mommy." The creature emerges from her closet each night and repeatedly asks, "Can I go inside your heart?" As Bela continues to refuse, the entity grows increasingly aggressive, threatening her entire family. Jessica Chastain takes on dual roles in the film, portraying both of Bela's parents as they struggle to understand the supernatural threat before time runs out.
Universal has scheduled Other Mommy for an October 9, 2026 release, positioning it as a major Halloween season attraction. The film was originally slated for May 8, 2026, but the studio pushed back the date to capitalize on the prime horror window. The move has drawn comparisons to Chastain's earlier horror hit Mama (2013), which also featured a maternal entity haunting children and was released in January, finding significant success.
Early Reactions and Cast
Social media reactions to the trailer have been overwhelmingly positive. One viewer described it as "genuinely interesting and creepy," singling out a shot of Chastain in a ball pit and another where she appears under a table "looking like a spider." Another called it "supremely creepy" and predicted the film would be "HUGE." The buzz suggests that Other Mommy could become one of the year's most anticipated supernatural horror releases.
The cast includes Jay Duplass (The Creep Tapes), Dichen Lachman (Severance), Karen Allen, Sean Kaufman, Adam Silver, and Carrie Dimaculangan. James Wan produces under his Atomic Monster banner in association with Blumhouse and Spin a Black Yarn. Succession writer Nathan Elston adapted Malerman's novel for the screen.
Why This Matters: Halloween Season Positioning and Horror Trends
The decision to debut the Other Mommy trailer exclusively with The Odyssey is a strategic play by Universal. Christopher Nolan's latest epic has been generating massive box office numbers—its previews alone brought in $17.6 million—making it the ideal platform to introduce a major horror property to a broad audience. The move mirrors industry trends where studios use blockbuster events to build momentum for upcoming releases.
October 2026 is shaping up to be a crowded horror landscape. With Other Mommy landing on October 9, it will have a prime slot just weeks before Halloween. The film joins a slate of horror titles that have been rescheduled or announced for the second half of 2026, reflecting the genre's continued dominance at the box office. Blumhouse and Atomic Monster, both renowned for low-to-mid-budget horror hits, are betting that the combination of a chilling premise, a literary source, and a star like Chastain will draw audiences.
The presence of Jessica Chastain in dual roles is also noteworthy. The actress, known for her Oscar-nominated work in The Help and Zero Dark Thirty, has built a strong horror resume with films like IT: Chapter Two, Crimson Peak, and Mama. Her ability to draw mainstream audiences to genre fare makes her a valuable asset for a property that aims to break out beyond horror enthusiasts.
Meanwhile, the success of Incidents Around the House as a novel—following Malerman's Bird Box phenomenon—provides a built-in fan base. The adaptation is being handled by a team with proven horror credentials: Savage earned acclaim for the Zoom-based horror Host and followed it with the Stephen King adaptation The Boogeyman. James Wan's involvement as producer adds further prestige, given his track record with The Conjuring universe.
Broader Implications: The State of Theatrical Horror and Franchise Building
The exclusive theatrical trailer debut underscores the ongoing tension between streaming and theatrical releases. While many trailers are released online simultaneously, Universal chose to reward in-theater audiences first, betting that the communal experience of seeing a preview on the big screen will generate stronger word-of-mouth. This tactic has been employed before—Nolan himself has advocated for theatrical exhibition—and it signals a continued commitment to the cinema experience for major genre releases.
Other Mommy also represents an interesting intersection of horror and literary adaptations. Following Bird Box, Malerman has become a go-to source for high-concept horror that translates well to visual media. The film's premise, which centers on a child confronted by a malevolent maternal figure, taps into deep-seated fears about family, protection, and the vulnerability of children. It's a theme that has resonated in recent horror hits like The Babadook and Hereditary.
For Jessica Chastain, Other Mommy continues her pattern of alternating between prestige dramas and genre fare. Her dual role performance will be closely watched, as playing two characters simultaneously offers opportunities for showy acting. The film also features a young lead in Arabella Olivia Clark, whose performance will be crucial in grounding the supernatural elements in genuine emotion.
With the trailer now playing in theaters and an online release imminent, Other Mommy is poised to become a major conversation point in horror communities. If early reactions are any indication, Universal's bet on a Halloween release could pay off handsomely. For now, audiences catching The Odyssey this weekend are getting an exclusive taste of what promises to be one of the most talked-about horror films of 2026.
As the industry watches how this film performs, it may also signal the staying power of horror as a reliable theatrical draw in an era dominated by superhero epics and franchise installments. The fact that a film like Other Mommy can command a trailer placement with a Nolan epic speaks to the genre's cultural and commercial weight.
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