Other Mommy Cast: Complete Actors & Roles Guide
The Other Mommy cast features Jessica Chastain in a dual role as Ursula and the sinister entity Other Mommy. Arabella Olivia Clark stars as seven-year-old Bela, alongside Jay Duplass as Bela's dad. Supporting actors include Karen Allen, Dichen Lachman, and Arian Moayed in director Rob Savage's 2026 supernatural psychological horror adaptation.
Cast photos
Jessica ChastainUrsula / Other MommyPhoto: Harald Krichel / CC BY-SA 4.0, via Wikimedia Commons
Jay DuplassBela's dadPhoto: Colleen Sturtevant / CC BY 4.0, via Wikimedia Commons
Karen AllenGrandma RuthPhoto: Michele Eve Photography / CC BY-SA 4.0, via Wikimedia Commons
Dichen LachmanLoisPhoto: PhilipRomanoPhoto / CC BY 4.0, via Wikimedia Commons
Arian MoayedFrankPhoto: Max / CC BY 3.0, via Wikimedia Commons
James WanProducerPhoto: Kirby Taylor / CC BY 4.0, via Wikimedia Commons
Josh MalermanAuthor of the novelPhoto: Somethinonya / CC BY-SA 4.0, via Wikimedia Commons
The 2026 supernatural psychological horror film Other Mommy brings Josh Malerman’s chilling novel Incidents Around the House to the screen with a powerhouse ensemble. Directed by Rob Savage for Blumhouse and Atomic Monster, the ninety-three-minute feature balances domestic drama with visceral body horror. Every performer contributes to an atmosphere of mounting claustrophobia as a sinister entity infiltrates a fragile suburban home.
Complete Other Mommy Cast and Character Overview
| Actor | Role / Character | Character Details |
|---|---|---|
| Jessica Chastain | Ursula & Other Mommy | Bela’s career-driven mother, and the mirroring trickster demon seeking Bela’s soul. |
| Arabella Olivia Clark | Bela (Isabela) | The seven-year-old daughter targeted by the malevolent presence. |
| Jay Duplass | Bela’s Dad | The stay-at-home father attempting to protect his family amid household tension. |
| Karen Allen | Grandma Ruth | Bela’s grandmother with prior experience confronting spirits. |
| Dichen Lachman | Lois | A skilled exorcist and ghost investigator summoned to confront the demon. |
| Arian Moayed | Frank | Ursula’s close friend entangled in personal secrets before facing the entity. |
| Sean Kaufman | Supporting Cast Member | Supporting ensemble cast member in the 2026 film. |
| Adam Silver | Supporting Cast Member | Supporting ensemble cast member in the 2026 film. |
| Rosie Anne O’Gorman | Supporting Cast Member | Supporting ensemble cast member in the 2026 film. |
Jessica Chastain in a Chilling Dual Performance
Jessica Chastain anchors the production by playing both Bela’s mother, Ursula, and the monstrous entity known as Other Mommy. Ursula represents a driven corporate professional struggling with domestic burdens and personal secrets. Chastain portrays Ursula with visible exhaustion, capturing the guilt of a parent whose emotional availability wavers under professional pressure.
When the malevolent trickster manifests, Chastain transforms her physical demeanor into an uncanny caricature of maternal affection. The entity mirrors Ursula’s face while whispering predatory requests to enter Bela’s heart. This duality functions brilliantly because the terror originates directly from the perversion of maternal comfort. Chastain crafts a striking contrast between a flawed mortal mother and an invasive predator exploiting family fissures. Audiences following the narrative through our plot summary can trace how Ursula’s maternal confessions directly parallel the creature’s psychological manipulations.
Arabella Olivia Clark as Young Protagonist Bela
Arabella Olivia Clark delivers an exceptional performance as seven-year-old Bela, carrying the emotional weight of the story. Casting news originally noted the actress was eight years old during production, and she displays astonishing range across demanding horror sequences. The camera remains tethered to Bela’s perspective, forcing viewers to experience the unraveling household through a child’s eyes.
Clark captures both innocent vulnerability and remarkable resilience when confronting supernatural terror. Bela endures terrifying hallucinations, spatially distorted rooms, and manipulative psychological attacks with grounded sincerity. Her character arc reaches a powerful climax as Bela remembers crucial family wisdom to resist the entity’s seductive promises of ending all pain. Readers comparing the cinematic adaptation with the original text in our book comparison guide will appreciate how Clark elevates Bela into an active defender of her own soul.
Supporting Cast and Household Dynamics
Jay Duplass brings grounded warmth and subtle anxiety to his role as Bela’s dad. Positioned as the primary caregiver at home, his character navigates brewing marital tension while striving to keep Bela safe from unseen threats. Duplass portrays the quiet strain of maintaining household stability amid Ursula’s corporate detachment and escalating domestic dread.
Karen Allen plays Grandma Ruth, introducing seasoned authority and emotional grounding during the family’s darkest hours. Ruth possesses past experience confronting hostile spirits, providing the embattled family with shelter when their home becomes unsafe. Her character delivers the pivotal thematic lesson that pain remains an unavoidable part of human life. This guidance ultimately arms Bela with the psychological strength required to defy the trickster demon.
Dichen Lachman appears as Lois, an experienced exorcist and ghost investigator recruited to assess the supernatural disturbance. Lois collaborates with Ruth to orchestrate a formal seance aimed at identifying the entity’s motives. Arian Moayed portrays Frank, Ursula’s close associate whose personal ties to the family generate suspicion and hasten the creature’s deadly strikes. Supporting cast members Sean Kaufman, Adam Silver, and Rosie Anne O’Gorman round out the ensemble, adding depth to the terrifying events.
Behind the Scenes: Director and Creative Crew
Director Rob Savage, known for helming Host and The Boogeyman, guides the production with sharp pacing and relentless tension. Screenplay writer Nathan Elston, recognized as a Succession writer and WGA award winner, translates Malerman’s prose into a sharp exploration of parental failure and demonic obsession. Producer James Wan oversees the production alongside Blumhouse, Atomic Monster, and Spin a Black Yarn on an estimated nineteen-million-dollar budget.
Executive producers Michael Clear, Judson Scott, Rob Savage, Josh Malerman, and Ryan Lewis contributed to developing the project. Principal photography took place in Dublin, Ireland, between May 12 and July 9, 2025. Filming initially commenced under the working title “Grandma’s House” before the studio officially retitled the movie Other Mommy in July 2025.
Lowell A. Meyer provides evocative cinematography, utilizing tight framing and eerie spatial distortions to mirror Bela’s psychological unraveling. Composer Patrick Jonsson delivers a chilling musical score that underscores the entity’s whispering threats. Film editor John Cutler maintains rigorous narrative momentum across the film’s ninety-three-minute running time.
Film enthusiasts can consult our detailed ending analysis for insights on how the creative team executed the climactic confrontation. Audiences seeking tickets and release options can explore our streaming release schedule for verified theater information and digital estimates.
FAQ
Who plays the dual lead role in Other Mommy?
Jessica Chastain portrays both Bela's mother Ursula and the shape-shifting demonic entity known as Other Mommy.
Who portrays the young protagonist Bela?
Arabella Olivia Clark plays seven-year-old Bela, anchoring the film from the child's perspective.
Which actor plays Bela's father in the movie?
Jay Duplass plays Bela's dad, portraying a stay-at-home parent navigating escalating supernatural danger.
Which filmmakers directed and produced Other Mommy?
Rob Savage directed the production, while James Wan produced alongside screenplay writer Nathan Elston.