Other Mommy - Official Trailer (2026) Jessica Chastain, Jay Duplass, Arabella Olivia

'Your mommy won’t save you. Can I go inside your heart?' Watch the trailer for Other Mommy, an upcoming horror movie starring Jessica Chastain, Jay Duplass, Arabella Olivia Clark, Dichen Lachman, with Arian Moayed and Karen Allen. From James Wan (Saw, Insidious and The Conjuring) and director Rob Savage (Host and The Boogeyman) comes a terrifying trip into the darkening world of a young girl, Bela, who forms a relationship with a sinister entity in her home who looks uncannily like her own mother. Jessica Chastain stars in a dual role as Bela’s mother and as “Other Mommy,” a manifestation of the entity. Jay Duplass plays Daddo, Bela’s father, and Arabella Olivia Clark plays Bela. From Blumhouse Atomic Monster, Other Mommy is directed by Rob Savage from a screenplay by WGA award winner Nathan Elston, based on the New York Times bestselling novel Incidents Around the House by Josh Malerman (Bird Box). The film is produced by James Wan, p.g.a., and is executive produced by Michael Clear, Judson Scott, Rob Savage, Josh Malerman and Ryan Lewis. Other Mommy opens in theaters on October 9, 2026.