Cast of the Monkey – Full List Roles and Details

The Monkey (2025) brings Stephen King’s beloved short story to the screen with a stacked cast that includes Theo James in a dual role as twin brothers, supported by Tatiana Maslany, Elijah Wood, and a roster of talented performers across multiple generations of characters. Directed and written by Osgood Perkins, the film blends supernatural horror with dark comedy as it explores what happens when two siblings discover their father’s cursed wind-up toy.

James Wan produces under his Atomic Monster banner, joining forces with Black Bear Pictures for this adaptation of King’s 1980 story about a wind-up monkey that triggers a chain of gruesome deaths. The cast spans both adult and child actors portraying the Shelburn family across different time periods as the curse follows the twins into adulthood.

With a release window set for 2025, the film marks a notable entry in the horror genre for its ensemble-driven approach to King’s material. Below is a comprehensive breakdown of the confirmed cast, character roles, and production details.

Cast of The Monkey (2025)

The ensemble brings together established horror talent and rising performers. Theo James leads the cast in a demanding dual performance, while the supporting lineup features performers from acclaimed television series and independent films.

The cast spans multiple generations of the Shelburn family, with Theo James carrying the adult roles as the twin brothers who must confront the supernatural consequences of their childhood discovery.

• Theo James delivers a dual performance as adult Hal and Bill Shelburn, marking one of the more challenging acting assignments in the horror genre for 2025
• Tatiana Maslany brings her Emmy-winning screen presence to the role of Lois, the twins’ mother whose family history becomes central to the story
• Elijah Wood appears as Ted Hammerman, the new husband of Hal’s ex-wife, adding recognizable star power to the ensemble
• Osgood Perkins takes on dual responsibilities as both writer-director and performer in the role of Chip Zimmer
• The production features Christian Convery and Colin O’Brien as the younger incarnations of the central characters
• Rohan Campbell portrays Ricky, a local character whose fate becomes intertwined with the monkey’s curse
• Notable horror connections include Danica Dreyer playing Annie Wilkes, sharing a name with Stephen King’s famous character from Misery

Who Plays Bill and the Twins in The Monkey?

The dual role of Hal and Bill Shelburn falls to Theo James, who brings both characters to life through separate performances that will be edited together to create the illusion of identical twins sharing scenes. This approach mirrors classic Hollywood techniques used in films featuring multiple roles for a single actor.

Theo James Takes on the Twin Brothers

Theo James, known for his work in the Divergent series and The Last of Us television adaptation, tackles one of his most physically demanding roles to date. The actor performs scenes opposite himself as both Hal and Bill, requiring careful choreography and multiple takes to achieve the seamless twin effect audiences expect from such performances.

James’s casting represents a significant draw for audiences familiar with his previous work in genre entertainment. His involvement brings mainstream appeal to a property that might otherwise attract primarily Stephen King enthusiasts and horror devotees.

The Shelburn Brothers’ Journey

Within the narrative, Hal and Bill discover the cursed wind-up monkey in their father’s old belongings and wind it up, setting in motion a series of deaths that occur around them. The film follows the twins as they attempt to discard the toy and separate their lives from its supernatural influence.

Their relationship evolves across time, with the siblings eventually growing apart as the horror continues to impact their lives. This emotional core distinguishes The Monkey from simpler horror entries, giving audiences characters to invest in beyond the scares.

The Monkey Movie Release Date

The Monkey is positioned as a 2025 theatrical release, though specific dates for premiere or wide distribution remain subject to change as studios adjust release calendars. The production was announced during the 2023 Cannes Film Market, placing it among the anticipated genre releases for the coming year.

Production Timeline and Development

Black Bear Pictures initiated development of the film adaptation during the Cannes Film Market in 2023, securing rights to Stephen King’s source material and attaching key creative personnel. Osgood Perkins was brought on to write and direct, bringing his distinctive visual sensibility to King’s darkly comic material.

James Wan’s involvement as producer through his Atomic Monster production company adds industry weight to the project. Wan’s track record with successful horror productions, including the Saw franchise and more recent hits like Malignant, positions The Monkey as a potentially significant entry in his filmography.

March 2024 Cast Announcements

Major cast members were officially revealed in March 2024, including Tatiana Maslany, Elijah Wood, Christian Convery, Colin O’Brien, Rohan Campbell, and Sarah Levy. These announcements coincided with promotional materials beginning to circulate through entertainment publications, generating early buzz for the project.

Cast of Young Hal and Kids in The Monkey

The younger incarnations of the Shelburn brothers are portrayed by Christian Convery, who plays both Hal and Bill during the childhood sequences that establish the curse’s origin. Colin O’Brien takes on the role of Petey, Hal’s son, whose storyline becomes entangled with the family curse in the present-day sections.

Christian Convery as the Young Twins

Christian Convery has built a resume of notable performances in television and film, with roles that showcase his range across dramatic and genre material. His casting as both young Hal and young Bill requires the same dual-performance approach that Theo James employs in the adult versions, creating visual continuity throughout the film.

The child actor performs the pivotal scene where the twins first discover and wind up the monkey toy, establishing the supernatural threat that will pursue them into adulthood. This sequence represents one of the film’s most critical moments, setting up the stakes for everything that follows.

Colin O’Brien as Petey Shelburn

Colin O’Brien plays Petey, the son of Hal and his ex-wife portrayed by Laura Mennell. Petey becomes a focal point in the narrative as the curse continues to affect the Shelburn family across generations. His relationship with his father provides an emotional anchor for the story’s more horrific elements.

The casting connects Petey to the broader family drama, with Elijah Wood appearing as Ted Hammerman, Hal’s ex-wife’s new husband. This arrangement creates additional tension and complexity in the family dynamics as the supernatural threat intersects with ordinary human relationships.

Production Timeline of The Monkey

Understanding the development arc provides context for the film’s position in the 2025 release calendar. The following timeline summarizes key milestones from announcement through casting completion.

1. 2023 — Black Bear Pictures announces development during Cannes Film Market
2. 2023 — Osgood Perkins confirmed as writer and director
3. 2023 — James Wan attached as producer through Atomic Monster
4. March 2024 — Major cast members publicly announced including Maslany, Wood, Convery
5. 2024 — Filming and post-production phases underway
6. 2025 — Theatrical release window anticipated

The relatively quick progression from announcement to production reflects the studio’s confidence in the project’s commercial viability and the creative team’s ability to deliver a polished horror experience within standard production timelines.

What Is Confirmed and What Remains Unclear

For audiences tracking The Monkey’s development, distinguishing between confirmed information and speculation helps manage expectations. The following comparison clarifies what we know with confidence versus what remains open to change.

Context: Stephen King Adaptations and Horror Trends

Stephen King’s short fiction has proven remarkably adaptable to various formats, from standalone films to limited series. The 1980 short story The Monkey presents a contained premise with expansion potential, making it suitable for the feature film treatment Osgood Perkins has developed.

Perkins brings prior horror credentials to the project, with his directorial work demonstrating an affinity for atmosphere and psychological dread over purely visceral approaches. This sensibility aligns well with King’s source material, which blends supernatural horror with darkly comic elements.

The involvement of James Wan and Atomic Monster connects The Monkey to a broader production philosophy emphasizing commercial horror that reaches mainstream audiences. This positioning suggests the film will balance artistic vision with accessibility, avoiding the more niche approaches that sometimes limit genre releases.

Comparable ensemble horror productions in recent years have performed well theatrically, suggesting market appetite for well-cast genre films with recognizable performers. The combination of Theo James, Elijah Wood, and Tatiana Maslany provides multiple selling points for different audience segments.

Sources and Official Information

Multiple authoritative sources confirm the cast and production details. IMDB maintains the official production record, while Wikipedia provides documented coverage of the film’s development based on verifiable public announcements.

“When twin brothers Bill and Hal find their father’s old cursed wind-up monkey toy in the attic, a series of gruesome and horrific deaths begins to occur around them. The siblings attempt to throw the toy away and move on with their lives, eventually growing apart over the years as the supernatural horror unfolds.”

— IMDB plot description for The Monkey (2025)

Rotten Tomatoes tracks the film’s presence in the entertainment database, providing a centralized location for audience and critic responses once reviews become available. These sources collectively offer the most reliable information for tracking The Monkey’s development and release.

Summary: Key Details About The Monkey Cast

The Monkey (2025) assembles an impressive ensemble headlined by Theo James in a dual role as twin brothers Hal and Bill Shelburn. Supporting performances from Tatiana Maslany as their mother Lois, Elijah Wood as a family outsider, and Osgood Perkins in a dual capacity as writer-director and performer create a richly staffed cast. The younger versions of the twins are portrayed by Christian Convery, while Colin O’Brien takes on the role of Hal’s son Petey.

The film adapts Stephen King’s 1980 short story under the direction of Osgood Perkins, with James Wan producing through his Atomic Monster banner. Planned as a theatrical release for 2025, The Monkey combines supernatural horror with family drama as it explores the consequences of discovering a cursed wind-up toy.