Other Mommy: How Scary Is the New Movie?

TL;DR — Other Mommy releases in theaters October 9, 2026, starring Jessica Chastain as a sinister entity that impersonates an 8-year-old girl's mother. Directed by Rob Savage (Host, The Boogeyman) and produced by James Wan, it's based on Josh Malerman's novel — the same author who wrote Bird Box. Based on the trailer and creative team, this looks genuinely unsettling rather than jump-scare-driven, so here's what to actually expect.

What is Other Mommy about?

Bela, an 8-year-old girl living in a home already strained by her parents' marital problems, begins encountering a sinister entity that emerges from her closet — one that looks and sounds exactly like her mother. The presence, which Bela calls "Other Mommy," grows increasingly threatening to her and her family as the story unfolds, forcing Bela to decide who she can actually trust in her own home.

Who's involved in making Other Mommy?

Jessica Chastain plays Ursula, Bela's real mother, alongside the impersonating entity. Rob Savage directs — known for Host and The Boogeyman, both genuinely effective, tension-driven horror rather than gore-focused films. James Wan produces through Atomic Monster, alongside Blumhouse Productions. The screenplay comes from Nathan Elston (a WGA Award winner for his work on Succession), based on Josh Malerman's novel Incidents Around the House — Malerman also wrote Bird Box, which should tell you something about the kind of dread this is going for.

When does Other Mommy come out, and where can I watch it?

Other Mommy releases in U.S. theaters on October 9, 2026, distributed by Universal Pictures — positioned just before Halloween, a natural release window for a supernatural horror film. It's a theatrical release only for now, with no streaming date confirmed.

How scary does Other Mommy actually look, based on what we know so far?

Here's the honest read, using the same approach we'd recommend for judging any horror film before committing: check what kind of scary it's actually going for, not just a vague "is it scary" question.

This looks like dread-driven horror, not jump-scare horror. The premise — a family member's exact double, but wrong — is built around slow-building distrust and uncanny valley discomfort rather than sudden shocks. Rob Savage's prior work (Host, The Boogeyman) leans the same direction: tension that builds rather than jolts you.

Jessica Chastain's dual-purpose casting is doing real work here. Playing both the real mother and the entity impersonating her means the horror lives in subtle physical and tonal shifts — a performance-driven kind of unease rather than makeup-heavy creature-horror.

The "child in danger" element is worth knowing if that's a specific sensitivity for you. Bela is 8 years old and central to the story's threat, which is a real, specific trigger for some viewers regardless of how the scares are delivered.

Should you be excited for this one?

If body-double dread and slow-building distrust (think The Substance's uncanny-double tension, applied to a family horror setting) appeals to you more than jump scares, this looks like a genuinely strong pick for the October horror season. If gore or fast-paced scares are what you're after specifically, this looks built for a different kind of unease entirely.

Frequently asked questions

Is Other Mommy based on a true story? No — it's based on Josh Malerman's 2024 novel Incidents Around the House, a work of fiction.

When does Other Mommy release? October 9, 2026, in U.S. theaters.

Who plays the villain in Other Mommy? Jessica Chastain plays both Bela's real mother and the sinister entity impersonating her.

Is Other Mommy connected to Bird Box? No direct connection — but it's written by the same novelist, Josh Malerman, so fans of Bird Box's slow-building dread may recognize a similar sensibility.

Want to check if this one fits your scare tolerance specifically?

We've written a full guide on how to know if a horror movie is too scary for you before committing to watch it — worth a read before October 9 if horror is hit-or-miss for you specifically.