Welcome back to Ultimate Fandom, your home for movie buzz, horror talk, and honest picks for your next watch. Today we are looking at Other Mommy, the supernatural horror film getting whispered about this October. Is it a spine-tingling treat or just another creepy-kid story? One note up front: the film arrives in US theaters on October 9, 2026, so this review is based on the trailer, the source novel, the cast, and the creative team, not a finished screening. Think of it as your pre-watch guide to deciding whether it deserves your ticket money.
Watch this Movie Trailer Below:
The Story Behind the Scares
Other Mommy follows Bela, an eight-year-old girl living in a home strained by marital trouble. Her loneliness opens the door to something strange: a presence that creeps out of her closet and looks exactly like her mother, Ursula. Bela calls it “Other Mommy.” At first it seems like comfort, a softer, more attentive version of the parent she needs. But the entity is not there to help. It wants to take up residence inside the girl, and first it needs her to let it in.
As the story unfolds, the creature outgrows the boundaries of Bela’s bedroom and begins to torment the entire household. The family is left with a terrifying question: which mother is real?
The film is based on Incidents Around the House by Josh Malerman, the author behind Bird Box. He knows how to build dread slowly and make ordinary spaces feel unsafe.
Cast and Crew
Jessica Chastain plays both Ursula and the Other Mommy herself, and that is the film’s biggest selling point. She is an Oscar winner who can swing from warmth to menace with a single look. Playing a mother and her uncanny copy gives her a rare chance to do both. Arabella Olivia Clark stars as Bela, with Jay Duplass, Dichen Lachman, Arian Moayed, and Karen Allen in supporting roles.
Rob Savage directs. Horror fans know him from Host and The Boogeyman, and he has a reputation for inventive, shock-driven scares. James Wan’s Atomic Monster is producing alongside Blumhouse, and the screenplay comes from Nathan Elston, a writer on Succession. That suggests the family drama could be as sharp as the frights.
What Looks Great
The doppelgänger fear. Few things unsettle us like a familiar face that is slightly wrong. A monster wearing a mother’s face attacks the one place children feel safest, and the best horror lives in that kind of violation.
A child’s point of view. Seeing the haunting through Bela’s eyes can make every shadow and creaking door feel bigger. It also adds an emotional layer, because a lonely child may want to believe the monster is kind.
A tight runtime. At roughly 93 minutes, the film should move briskly. Horror often overstays its welcome, and a lean runtime keeps the tension high with little time to sag.
Serious pedigree. Chastain, Savage, Wan, and Malerman is an impressive combination. At Ultimate Fandom, we get excited when a horror film pairs real acting talent with a director who understands scares.
What Might Not Work
No film is guaranteed to deliver, and a few concerns are worth keeping in mind. The creepy-child-and-haunted-house formula is familiar, so Other Mommy will need fresh ideas to stand out. Fans of Malerman’s novel may also notice changes in the adaptation, since the film shifts the title and tone.
There is also the comparison problem. Stories about children and sinister “other” parents invite comparisons to older, well-loved horror, and the bar is high. If the film leans too hard on jump scares instead of atmosphere, it could feel hollow. Since reviews are not out yet, treat early hype with a little caution.
Who Should Watch It
This movie looks perfect for fans of psychological and supernatural horror, viewers who enjoyed The Boogeyman or Bird Box, and anyone who wants to see Jessica Chastain in a darker role. It is rated R for language and some bloody violence, so it is not for younger kids or anyone who dislikes intense scares. Parents should be aware that the central threat involves a child in danger, which can hit harder than usual.
Final Verdict Worth Watching Tonight
Here is the honest answer. Because the film opens October 9, you cannot catch it tonight, but you can mark your calendar. Based on everything we know, Other Mommy looks like one of the more promising horror releases of the season. The premise is genuinely creepy, the lead performance sounds like a showcase, and the creative team has a strong record with scares.
If you love horror, plan to see it in a theater with a crowd, where the screams and silences hit hardest. If you are on the fence, wait for the first critic reviews and audience scores. We will update our take on Ultimate Fandom once we have seen the finished film.
FAQs
When does Other Mommy release?
The film opens in US theaters on October 9, 2026, distributed by Universal Pictures.
Who stars in Other Mommy?
Jessica Chastain plays both Ursula and the Other Mommy. Arabella Olivia Clark plays Bela, and the cast includes Jay Duplass, Dichen Lachman, Arian Moayed, and Karen Allen.
Is Other Mommy based on a book?
Yes. It is adapted from Josh Malerman’s novel Incidents Around the House. Malerman also wrote Bird Box.
What is the rating and runtime?
It is rated R for language and some bloody violence, and the runtime is about 1 hour 33 minutes.
Where can I find more movie reviews like this one?
You can read more reviews, release guides, and fan discussions on Ultimate Fandom, where we cover new horror and entertainment releases regularly.
