**The trailer for the upcoming horror film "Other Mommy," starring Jessica Chastain in dual roles as a mother and a sinister entity mimicking her, has generated strong early buzz for its unsettling imagery and premise centered on an eight-year-old girl.** Releasing in theaters October 9, 2026, the project draws on Chastain's prior horror experience in films like "Mama," positioning it as a potential standout scary release ahead of the fall season. Trader sentiment reflects typical pre-release dynamics for horror entries, where effective marketing and genre hype often support solid critic scores, though outcomes remain highly variable until reviews aggregate post-premiere. Key near-term catalysts include any additional promotional materials or early critic screenings that could shift expectations before wide release.