Jessica Chastain’s New Horror Flick ‘Other Mommy’ Unleashes a Chilling First Trailer

When the first glimpse of a horror film lands on YouTube, you can usually tell whether it’s a clever tease or just cheap jump‑scares. The new trailer for Other Mommy does a little of both, and for fans of the genre it leans heavily toward the former.

Directed by British genre‑maker Rob Savage—best known for his knack for building dread with minimal resources—the film follows eight‑year‑old Bela (played by newcomer Arabella Olivia Clark) as she discovers a nightmarish presence lurking inside her bedroom closet. She calls it “Other Mommy,” a dark doppelgänger that seems to feed on the cracks in her family’s marriage.

Jessica Chastain steps into the role of the mother, bringing her usual gravitas to a character who must confront a terrifying, almost mythical threat while trying to hold her crumbling household together. Dichen Lachman rounds out the core cast, adding further depth to the strained dynamics.

The trailer, dropped on Tuesday, opens with a quiet, almost lullaby‑like scene of Bela’s bedroom—a stark contrast to the sudden, jarring bursts of sound that accompany every glimpse of the closet’s gaping maw. The cinematography feels deliberately claustrophobic, and Savage’s signature use of practical effects makes the entity feel unsettlingly real.

Online reactions have been swift. One commenter wrote, “I’m not usually a horror fan, but this trailer actually gave me goosebumps,” while another added, “Sometimes the scariest movies come out of nowhere—keep an eye on this one.” The consensus? The teaser is genuinely creepy and sets the bar high for the October 9, 2026 release.

Beyond the scares, there’s an emotional undercurrent that hints the film might explore more than just jump‑scares. The family’s marital problems are woven into the narrative, suggesting that the “Other Mommy” could be a metaphor for unresolved trauma—a theme Savage has flirted with in previous works.

If you’re curious (and brave enough) to watch the full trailer, click the link below. And when the movie finally hits theaters, feel free to drop your thoughts at david.hookstead@outkick.com—you’ll probably want to share how the closet scene made you feel.

Mark your calendars: Other Mommy opens in U.S. theaters on October 9, 2026. Whether you’re a die‑hard horror aficionado or just someone who enjoys a good, spine‑tingling story, this one looks worth the night‑time viewing.