Other Mommy: Release Date, First Trailer, and How to Watch
Jessica Chastain's new Blumhouse horror film Other Mommy opens in theaters October 9, 2026, and the first trailer is out now. Here is the release plan and how to watch.
The first trailer for Other Mommy is out, and it arrived with a stunt built for attention: Universal attached it to theatrical screenings of Christopher Nolan’s The Odyssey before releasing it online on July 21. If you are here after seeing the trailer, or after hearing about it, here is everything confirmed so far: when the movie opens, where you can watch it, and what the trailer actually shows.
The quick answer
- Release date: October 9, 2026, confirmed on Universal’s official movie site
- Where: movie theaters only at launch; no streaming release has been announced
- Trailer: out now on Blumhouse’s official YouTube channel (embedded below)
- Who: Jessica Chastain in a dual role, in a Blumhouse horror film released by Universal Pictures
- Tickets: not on sale yet; Universal’s site currently offers a save-the-date calendar option
When and where Other Mommy comes out
Universal’s official page for the film lists a single fact that matters most: in theaters October 9, 2026. That lands the film squarely in the October horror corridor, the launch window studios reserve for their biggest scare titles ahead of Halloween.
The release is theatrical. No streaming date, platform, or digital rental window has been announced. Universal theatrical releases have typically reached digital retailers first and streaming later, but treat anything beyond the October 9 theater date as unconfirmed until the studio says otherwise.
What the trailer shows
The trailer introduces Jessica Chastain as a mother whose family is terrorized by a double of herself, the “Other Mommy” of the title. Chastain plays both sides of that mirror: the real mother and the wrong one. The footage leans on the film’s central question, delivered by a child’s voice: which one is the real mommy?
The film adapts Josh Malerman’s 2024 novel Incidents Around the House. Malerman is the author of Bird Box, another book that became a widely watched horror adaptation. Rob Savage directs, with James Wan’s Atomic Monster and Blumhouse producing.
How to watch it (now and later)
- Right now: watch the official trailer below, hosted on Blumhouse’s verified YouTube channel
- October 9, 2026: the film opens in US theaters; check your local chain closer to the date
- Tickets: major chains usually open horror presales a few weeks out; nothing is live yet
- Streaming: unannounced; be wary of any site claiming to stream the film early, because no legitimate early stream exists
Why the trailer is everywhere this week
Universal premiered the trailer exclusively in front of The Odyssey, one of the year’s biggest theatrical events, before posting it online. That guaranteed the first audience saw it on the biggest screens possible, and reaction clips did the rest. It is the same playbook studios have used for major horror reveals: borrow the year’s largest captive audience, then let the internet amplify it.
Bottom line
Other Mommy opens in theaters on October 9, 2026. The trailer is real and official, streaming plans do not exist yet, and the only legitimate places to follow the film right now are Universal’s movie site and Blumhouse’s official channels.
Release details verified against Universal Pictures’ official movie site and Blumhouse’s official trailer as of July 23, 2026. If the release plan changes, this guide will be updated with the revision noted.