Mouthwashing Horror Movie Confirmed With Jennifer's Body Director Karyn Kusama and Sinister Filmmaker Scott Derrickson

Mouthwashing Horror Movie Confirmed With Jennifer's Body Director Karyn Kusama

One of the most disturbing independent horror games of recent years is officially heading to the big screen.

Sony Pictures' Screen Gems has acquired the film rights to Mouthwashing, the acclaimed psychological horror game developed by Wrong Organ and published by Critical Reflex.

The adaptation has already assembled an impressive collection of established horror filmmakers.

Karyn Kusama, best known for directing Jennifer's Body and The Invitation, has signed on to direct the film.

Meanwhile, Sinister and The Black Phone director Scott Derrickson will produce alongside C. Robert Cargill and Vince Cheng through their production company Crooked Highway.

Matt Manfredi and Phil Hay, who previously collaborated with Kusama on The Invitation and Destroyer, will write the screenplay.

The announcement was confirmed on 29 October 2026, marking another major development in the growing number of horror video games being adapted for cinema.

What Is Mouthwashing About?

Originally released for PC in September 2024, Mouthwashing is a first-person psychological horror game set aboard a doomed space freighter called the Tulpar.

The ship belongs to the fictional Pony Express delivery company and is carrying five crew members on what should have been a routine journey.

However, disaster strikes when the vessel crashes into an asteroid, leaving its occupants stranded in deep space.

With the ship badly damaged and supplies running dangerously low, the crew must confront the possibility that nobody is coming to rescue them.

Their situation becomes increasingly desperate as isolation, paranoia and personal conflicts begin tearing the group apart.

The game's narrative explores the circumstances surrounding the crash and the relationships between the surviving crew members.

Rather than relying on constant combat or conventional monsters, Mouthwashing creates horror through psychological tension, disturbing imagery and the gradual revelation of deeply uncomfortable truths.

The experience also uses a nonlinear narrative, moving between different moments in the story to challenge the player's understanding of what happened.

Its combination of science-fiction horror and psychological storytelling helped establish it as one of 2024's most memorable independent games.

Karyn Kusama Will Direct the Adaptation

Karyn Kusama is an interesting choice to bring Mouthwashing to cinemas.

The filmmaker has considerable experience exploring psychological manipulation, dysfunctional relationships and characters trapped in increasingly dangerous circumstances.

Her 2009 film Jennifer's Body, starring Megan Fox and Amanda Seyfried, has developed a substantial cult following since its original release.

Although initially met with a mixed reception, the supernatural horror comedy has since been reassessed by audiences and critics.

Kusama followed it with The Invitation in 2015, a psychological thriller about a dinner party that becomes increasingly unsettling as the evening progresses.

The film received considerable praise for its atmosphere, slow-building tension and exploration of grief.

Those qualities could prove particularly valuable when adapting Mouthwashing.

Much of the game's horror comes from its characters' relationships and the psychological consequences of their circumstances.

Kusama's experience with intimate, character-driven horror suggests she could be well suited to the material.

She has also directed episodes of television series including Yellowjackets, further demonstrating her experience with dark and emotionally complex storytelling.

Scott Derrickson Joins as Producer

Another significant name attached to the project is Scott Derrickson.

Derrickson is best known to horror audiences for directing Sinister, The Exorcism of Emily Rose and The Black Phone.

He also directed Marvel Studios' Doctor Strange.

For Mouthwashing, however, Derrickson will serve as a producer rather than director.

He will work alongside C. Robert Cargill and Vince Cheng through Crooked Highway, which has a production agreement with Sony's Screen Gems.

Cargill previously collaborated with Derrickson on Sinister and The Black Phone, contributing to both films' screenplays.

Their involvement brings additional experience in supernatural and psychological horror to the adaptation.

Although the film's creative direction has not been revealed, the combination of Kusama and Derrickson provides an experienced production team with a strong background in the genre.

Who Is Writing the Mouthwashing Movie?

The screenplay will be written by Matt Manfredi and Phil Hay.

The pair have an established working relationship with Kusama, having collaborated on The Invitation and the crime thriller Destroyer.

Their involvement is particularly noteworthy because Mouthwashing is not a straightforward story to adapt.

The original game uses a fragmented narrative structure, gradually revealing information about its characters and the circumstances surrounding their predicament.

That approach is central to the experience.

A film adaptation will need to translate those revelations into a cinematic format without losing the atmosphere that made the game effective.

Manfredi and Hay's previous experience with complex characters and psychological tension could help preserve those qualities.

However, no official screenplay details have been released.

It remains unknown whether the film will follow the game's narrative closely or introduce substantial changes.

Why Mouthwashing Became Such a Popular Horror Game

Mouthwashing became a significant success within the independent horror gaming community following its original release.

Developed by Swedish studio Wrong Organ and published by Critical Reflex, the game attracted attention for its distinctive visual presentation and uncompromising subject matter.

Its low-polygon graphics evoke the appearance of older video games, while its unsettling environments and surreal sequences create a disturbing atmosphere.

Unlike many survival horror titles, Mouthwashing places relatively little emphasis on weapons or fighting enemies.

Instead, players explore the Tulpar, interact with its crew and piece together the events leading to their predicament.

The narrative deals with themes including responsibility, denial, guilt and the consequences of unchecked power.

These subjects give the game an emotional weight that extends beyond its science-fiction setting.

Its success has also been recognised through industry awards.

Mouthwashing received Best Narrative and Players' Choice honours at the Horror Game Awards.

According to publisher Critical Reflex, the game has sold more than 800,000 copies.

Its popularity across streaming platforms and social media has introduced the story to audiences beyond those who have played it themselves.

Could the Film Capture the Game's Psychological Horror?

Adapting Mouthwashing presents an unusual challenge.

The original game is relatively short, with many players completing it in approximately two to three hours.

However, its impact comes from how information is revealed rather than the overall length of the experience.

The story frequently challenges the player's assumptions about its characters.

It also uses surreal imagery and uncomfortable situations to create a sense of unease.

A successful adaptation would need to preserve those qualities while finding ways to make the experience work for cinema audiences.

The claustrophobic setting aboard the Tulpar could translate particularly well to film.

With only a handful of characters trapped inside a damaged spacecraft, the production has an opportunity to emphasise isolation and interpersonal conflict.

The science-fiction setting also provides considerable scope for disturbing visual sequences.

However, the filmmakers have not revealed whether the adaptation will recreate specific moments from the game.

For now, any predictions about its structure or ending remain speculation.

Mouthwashing Also Arrives on Consoles

The film announcement coincides with another important milestone for the franchise.

On 29 October 2026, Mouthwashing expanded beyond its original PC release and launched on consoles.

The game is now available on PlayStation 4, PlayStation 5, Xbox consoles and Nintendo Switch.

It is also available through supported Xbox Game Pass subscriptions.

The wider release gives a new audience an opportunity to experience the original story before its film adaptation arrives.

For horror fans unfamiliar with the game, this could be an ideal opportunity to discover why it has attracted so much attention.

When Will the Mouthwashing Movie Be Released?

At present, the Mouthwashing movie does not have an official release date.

Sony Pictures has acquired the adaptation rights and confirmed the principal creative team, but the project remains in development.

No actors have been announced, and there is no confirmed filming schedule.

The studio has also not revealed whether the film will receive a wide theatrical release or follow another distribution strategy.

Although the production is being developed through Screen Gems, specific release arrangements have yet to be confirmed.

There is currently no official movie trailer, poster or production footage.

Any suggested release window would therefore be speculative.

A Promising New Video Game Horror Adaptation

Video game adaptations have become increasingly prominent within the film industry, but Mouthwashing offers something different from the usual action-heavy franchises.

Its appeal lies in its disturbing characters, psychological themes and the oppressive atmosphere of a damaged spacecraft.

Those elements could translate effectively to cinema with the right creative approach.

Karyn Kusama's experience directing character-driven psychological horror makes her involvement particularly encouraging.

Meanwhile, Scott Derrickson, C. Robert Cargill and Vince Cheng bring additional genre experience to the production.

The decision to reunite Kusama with screenwriters Matt Manfredi and Phil Hay also suggests an emphasis on strong character development.

Whether the adaptation can reproduce the impact of the original game remains to be seen.

For now, horror fans have an intriguing new project to follow.

The Mouthwashing movie is officially in development at Sony Pictures' Screen Gems, with Karyn Kusama directing and Scott Derrickson producing. Casting, filming dates and a release window have not yet been announced.