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Jessica Chastain’s New Maternal Nightmare Is Officially Here in Horrifying First Trailer
A first trailer has been released for "Other Mommy," a horror film directed by Rob Savage and starring Jessica Chastain, ahead of its October cinema release. The film follows Ursula, a mother in a troubled marriage whose family life deteriorates further when a sinister entity resembling her begins to threaten them, and it arrives amid a particularly strong year for the horror genre.
The film is based on Josh Malerman's 2024 novel "Incidents Around the House" and sees Chastain play dual roles as both Ursula and the menacing double dubbed "Other Mommy" by her eight-year-old daughter, Bela, played by Arabella Olivia Clark. The teaser, which had already been shown to cinema audiences ahead of Christopher Nolan's "The Odyssey," depicts Ursula's seemingly loving demeanour giving way to something monstrous when her husband, Russ (Jay Duplass), discovers the creature in a twisted, inhuman form. The cast also includes Dichen Lachman, Karen Allen, Sean Kaufman, Adam Silver and Carrie Dimaculangan.
In short
- "Other Mommy" trailer released, starring Jessica Chastain in dual roles.
- Film based on Josh Malerman's novel, directed by Rob Savage.
- Due in cinemas in October, part of a strong 2026 horror year.
Explained simply
"Other Mommy" is a horror film centring on a woman named Ursula whose troubled marriage deteriorates further when a sinister version of herself emerges to threaten her family. The film adapts Josh Malerman's 2024 novel "Incidents Around the House" and follows a family confronted by an unexplained doppelgänger.
Jessica Chastain plays both Ursula and the threatening double, with her eight-year-old daughter Bela (played by Arabella Olivia Clark) identifying the creature as "Other Mommy". The film is directed by Rob Savage and features Jay Duplass as Ursula's husband Russ, alongside supporting cast including Dichen Lachman and Karen Allen.
The film arrives during a period when horror cinema has been experiencing notable commercial and critical success, positioning this release as a significant entry in the genre. The involvement of an established actor like Chastain in a horror production reflects the genre's current appeal to major talent and audiences.