Jessica Chastain's Other Mommy Opens to 27 Million Dollars and Proves Horror Still Owns October

Jessica Chastain's horror thriller "Other Mommy" topped the domestic box office over the October 9-11 weekend with a twenty-seven-million-dollar opening, delivering the fourth-highest horror debut of 2026 and reinforcing October's reputation as the month when audiences flock to theaters for scares.

The film, directed by Rob Savage and adapted from Josh Malerman's bestselling novel, earned an additional $17.7 million overseas for a global opening weekend total of $45.2 million. Those numbers surpassed industry projections that had pegged "Other Mommy" for a twenty-to-twenty-nine-million-dollar domestic start, landing near the high end of expectations despite mixed reviews.

Chastain plays a mother whose young daughter begins exhibiting disturbing behavior after claiming to see "another mommy" in their home. The premise—equal parts psychological thriller and supernatural horror—tapped into parental dread in a way that resonated with audiences who packed theaters on Friday and Saturday night. The film's marketing leaned heavily on Chastain's dramatic pedigree and Savage's reputation for tense, claustrophobic horror after his breakout pandemic-era film "Host" became a cult hit.

The domestic opening put "Other Mommy" behind only "Backrooms," "Scream 7," and "Resident Evil" for horror releases in 2026, a year that has seen the genre continue its box-office dominance from the post-pandemic era. Horror films have outperformed projections all year, driven by young audiences who turn theatrical horror releases into social events and older viewers who appreciate studios investing in adult-oriented storytelling that doesn't rely on superheroes or franchises.

The weekend results also pushed the domestic box office past the eight-billion-dollar threshold for 2026, reaching $8.073 billion through Sunday, October 11, according to industry analyst Paul Dergarabedian. That milestone came earlier in the calendar year than expected, thanks in part to a strong summer anchored by blockbuster sequels and a surprisingly robust September that saw horror and adult dramas over-perform at the multiplex.

Critical reception for "Other Mommy" was decidedly mixed, with reviewers praising Chastain's committed performance and Savage's atmospheric direction while faulting the film's third-act twist for feeling telegraphed and its conclusion for leaving too many narrative threads unresolved. The film currently sits at a middling score on Rotten Tomatoes, but horror audiences have proven time and again that they'll show up opening weekend regardless of reviews if the marketing delivers the right tone and the premise hits the sweet spot between familiar and fresh.

Chastain, who won an Academy Award for her performance in "The Eyes of Tammy Faye" and has built a career on intense dramatic roles, took a calculated risk by signing on to "Other Mommy" as both star and executive producer. Horror has proven to be a reliable launchpad for actors looking to expand their range—recent examples include Lupita Nyong'o in "Us," Florence Pugh in "Midsommar," and Toni Collette in "Hereditary"—and Chastain's involvement brought prestige credibility to a genre that still fights for respect despite consistently delivering box-office returns.

The film's success bodes well for the rest of October, which has several horror releases queued up to capitalize on Halloween-season demand. "Other Mommy" will face competition next weekend from a high-profile sequel and a buzzy indie horror film that has been tracking well with younger audiences, but its strong opening weekend gives it momentum heading into the final two weeks before Halloween when ticket sales historically spike.

For Chastain, the box-office validation is a reminder that horror doesn't have to sacrifice adult storytelling to succeed commercially. "Other Mommy" may not be a critical darling, but it delivered exactly what audiences wanted: a tense, atmospheric thriller anchored by a powerhouse performance from one of Hollywood's most respected actors. That formula worked, and it worked big.