Jessica Chastain is a terrifying clone in Other Mommy trailer
Jessica Chastain stars in dual roles in Blumhouse and Universal's Other Mommy, playing both a doting mother and a body-twisting doppelganger entity. The trailer, released July 21, 2026, shows a young girl bonding with a sinister "Other Mommy" who looks like her mom. The horror film hits theaters October 9.
Key Takeaways
- Jessica Chastain plays both Ursula and a sinister home-invading doppelganger in Other Mommy.
- Universal Pictures and Blumhouse released the trailer on July 21, 2026.
- Arabella Olivia Clark stars as Bela; Jay Duplass plays the girl's father.
- Rob Savage directs the adaptation of the 2025 novel Incidents Around the House.
- Other Mommy opens in theaters on October 9, 2026.
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What does Jessica Chastain do in the Other Mommy trailer?
According to People, Chastain doubles as Ursula — Bela's mother — and as a paranormal entity that has invaded the family's home and taken Ursula's likeness. The daughter calls the being "Other Mommy."
The clip turns from domestic calm to body horror fast. "Other Mommy" cooks pasta for Bela, who notes the entity is not supposed to leave her room. When the father checks the kitchen, he finds the being under the table with limbs folded around her like a spider.
Nerdist notes another chilling beat: the doppelganger asks Bela if she remembers when they were one before she was in her mom's belly. Bela initially claims the double is nice, but the trailer pushes the threat into stalker territory.
Who else is in Other Mommy, and who is directing?
Arabella Olivia Clark plays young Bela. Jay Duplass appears as Ursula's husband. The supporting cast also includes Dichen Lachman, Arian Moayed, and Karen Allen.
Rob Savage directs. He most recently released the 2023 horror film The Boogeyman. Chastain was first linked to the project when Deadline reported she would star in Savage's adaptation of the 2025 novel Incidents Around the House.
An official synopsis frames the story as a terrifying trip into Bela's darkening world as she forms a relationship with a sinister entity who looks uncannily like her mother. Nerdist compared the vibe to Coraline's spooky other mother — without the button eyes.
When does Other Mommy come out, and why does it matter?
Other Mommy is scheduled for theaters on October 9. The timing puts the Universal–Blumhouse scare squarely in early Halloween season.
For Chastain, the film marks a notable return to horror after Mama (2013) and It: Chapter Two (2019). Since winning an Oscar for The Eyes of Tammy Faye, she has largely focused on dramas and prestige TV.
The trailer's body-twisting clone imagery is the clear hook: same face as the mother, wrong body language, wrong rules. If the finished film digs deeper into why Bela trusts the entity, Other Mommy could be one of fall's most talked-about family nightmares.