Universal Pictures and Blumhouse released the official trailer for the supernatural horror film "Other Mommy" on Tuesday [1].

The release marks a high-profile return to the horror genre for Jessica Chastain, who takes on a dual role as both a mother and a sinister entity. The project brings together director Rob Savage and producer James Wan, combining their experience in psychological and supernatural cinema to target the autumn movie-going season.

The two-minute trailer [2] introduces a plot centered on a mother and her daughter, featuring a demon doppelganger. The footage emphasizes a tense, supernatural atmosphere, showcasing a young girl named Bela and a moth-like entity. Dialogue in the preview highlights the film's central conflict, with one character saying, "Somebody was in the house... she looked like you" [3].

Chastain is joined by a supporting cast that includes Jay Duplass, Arabella Olivia Clark, Dichen Lachman, Arian Moayed, and Karen Allen. The trailer's voice-over further establishes the film's menacing tone, asking, "Your mommy won’t save you. Can I go inside your heart?" [4]

The film is slated for theatrical release on Oct. 9, 2026 [5]. The production combines the resources of Universal Pictures and Blumhouse, with James Wan attached to the project [6].

Industry observers said the trailer was released on July 21, 2026 [7], strategically timing the promotional cycle to build anticipation for the October debut.

“"Your mommy won’t save you. Can I go inside your heart?"”

The collaboration between Rob Savage and James Wan, paired with Chastain's dual performance, suggests a shift toward high-concept psychological horror. By scheduling the release for early October, the studio is positioning 'Other Mommy' to capitalize on the peak seasonal demand for horror cinema, leveraging Chastain's star power to elevate the film beyond standard genre tropes.