Jessica Chastain is back in the horror genre — and she’s pulling double duty this time.

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Universal Pictures released the first trailer for Other Mommy on Tuesday, in which Chastain plays Ursula, a mother whose evil clone — referred to as “Other Mommy” — terrorizes her daughter, Bela (Arabella Olivia Clark). “Can I go inside your heart?” Other Mommy says to Bela.

Things ramp up toward the end of the trailer when it becomes challenging for Bela to tell if she’s indeed talking to her mom or Other Mommy. The trailer has been playing exclusively to screenings of Christopher Nolan’s The Odyssey, which is also from Universal.

Here is the official synopsis: “Bela, an 8-year-old girl living in a home with marital problems, confronts a sinister entity that comes out of her closet. The presence, who she calls ‘Other Mommy,’ becomes increasingly threatening to her and her family.”

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Other Mommy also marks Chastain’s return to the horror genre. The Oscar winner has previously starred in Take Shelter (2011), Mama (2013), Crimson Peak (2015) and It: Chapter Two (2019).

The film is an adaptation of the New York Times bestselling novel Incidents Around the House. Rob Savage (Host, The Boogeyman) is directing from a screenplay by Nathan Elston (Succession). Jay Duplass, Dichen Lachman, Arian Moayed and Karen Allen round out the cast.

James Wan (Obsession, Backrooms and Conjuring franchises) of Blumhouse Atomic Monster produces with Michael Clear, Judson Scott, Savage, Josh Malerman and Ryan Lewis serving as executive producers.

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Other Mommy is slated to release in theaters on Oct. 9. Watch the trailer below.