‘Other Mommy’ Release Date, Plot, Cast, Trailer and Where to Watch Featuring Jessica Chastain

Jessica Chastain is making her return to the horror genre, and the first glimpse of ‘Other Mommy‘ has already begun to circulate after its debut during select screenings of Christopher Nolan’s ‘The Odyssey’. Moviegoers who experienced it in theaters have expressed their reactions, and the preview has quickly become one of the most discussed horror teasers of the season.

If you’re curious about what to expect, you’re in the right place. Here’s everything we know about ‘Other Mommy,’ including its theatrical release date, cast details, plot, and how to watch it.

‘Other Mommy’ is set to hit theaters on Friday, October 9, 2026. The film’s release date was adjusted from its original schedule of May 8, 2026, by Universal, placing it right in the heart of the spooky season.

Currently, this is a theatrical release. Blumhouse, Atomic Monster, and Universal are bringing the film to cinemas, so fans will need to purchase tickets at their local theaters.

For those hoping for a streaming option, that information will have to wait. Digital release and streaming details are typically revealed only after a movie has premiered in theaters.

The trailer was publicly released on Tuesday, July 21, by Universal Pictures UK. It features a young girl named Bela who becomes attached to a mysterious woman that bears an uncanny resemblance to her mother. The situation quickly escalates into horror.

One of the standout moments features the lookalike preparing food for Bela and crawling under a kitchen table with a twisted body, leaving the family in fear. Online viewers have taken note, with one fan commenting that this under-the-table scene was particularly unsettling.

The trailer has garnered enough fright that early viewers have labeled it as pure nightmare fuel. Another viewer remarked on its compelling nature, raising the question of whether the film can meet the high expectations set by the preview. This is a common challenge for horror films that generate early buzz.

Chastain stars in a dual role, portraying both Bela’s mother and Other Mommy, a manifestation of the entity. For an Oscar winner, this is a bold move that allows her to showcase both warmth and menace within the same film. Hollywood Life highlights that she had to take on both roles during filming.

The cast is filled with familiar faces. Jay Duplass plays Russ, Bela’s father and Ursula’s husband, while Arabella Olivia Clark takes on the role of Bela. The ensemble also features Dichen Lachman, Arian Moayed, Karen Allen, Sean Kaufman, Adam Silver, and Rosie Anne O’Gorman.

Behind the scenes, Rob Savage, known for ‘Host’ and ‘The Boogeyman,’ directs the film from a screenplay by Nathan Elston. Produced by James Wan and Blumhouse Atomic Monster, this collaboration has fans anticipating a truly unsettling experience.

The plot revolves around Bela, a young girl in a household facing marital strife, who encounters a sinister entity emerging from her closet. She names this presence Other Mommy, which increasingly threatens her and her family. The most chilling aspect is how eerily familiar the creature appears.

The film is also based on Josh Malerman’s book ‘Incidents Around the House’. The novel tells the story of a family haunted by a supernatural force intent on taking residence within the girl.

With a reliable horror team, a standout dual performance, and a trailer that has already unsettled audiences, ‘Other Mommy’ is shaping up to be a must-see scare this October. The big question remains: will watching Chastain confront a version of herself leave you sleeping with the lights on? Which of her two characters do you think will haunt you more?