Sanguine, also known as Mutation and Species, is seemingly taking the idea of losing your mind idea considerably further than a lot of horror films do - this French-Belgian body horror from first-time feature director Marion Le Corroller turns the pressures of starting a career into a physical transformation, with a young doctor discovering that the increasingly bizarre cases arriving at her hospital might have something to do with what is happening to her own body.
The film has already had a pretty busy festival run in 2026, including a Midnight Screening at the Cannes Film Festival, and it closed this year's Tubi FrightFest in London, and it now has a French theatrical release scheduled for October 28.
A Doctor Starts Seeing Something Very Wrong
Mara Taquin plays Margot, a young intern beginning her career in one of France's most demanding emergency departments, where she is trying to keep up with the workload and the expectations placed on her, but things become increasingly strange when young patients begin arriving with unexplained and unusual physical symptoms.
At first, Margot is approaching these cases as a doctor trying to work out what is happening to her patients, but that becomes considerably more complicated when she starts experiencing disturbing symptoms herself, including unexplained bleeding and increasingly obvious changes to her body.
There is also a wider mystery behind the patients arriving at the hospital, where the recurring cases eventually force her to question whether there is something connecting all of these strange symptoms.
Opposite Taquin is Karin Viard, playing Hélène, the head of the emergency department - Hélène is a highly respected doctor who has very little interest in making life easy for the younger people working underneath her, and Margot quickly discovers just how demanding the environment can be.
The rest of the main cast includes Kim Higelin as Pauline, Sami Outalbali as Louis, Stefan Crepon as Clément and Sonia Faïdi as Lila, with the film also featuring Clément Bresson, Mukit Abdul Hamid and others.
Marion Le Corroller's First Feature
Mutation is Marion Le Corroller's feature debut, although she had already made several short films before moving into feature filmmaking - she studied international affairs at the Sorbonne before completing a master's degree in screenwriting at Nanterre and initially worked in film production before moving into directing, and her previous short films include Dieu n'est plus médecin, which also dealt with a young doctor, and Poupée fondue, a body-horror short released in 2024.
For her influences, Le Corroller has cited Ari Aster and Yorgos Lanthimos, particularly their framing, strange visual choices and willingness to make audiences uncomfortable, and she has also acknowledged the obvious comparisons with the recent wave of French body horror, although her own explanation of the genre is more straightforward - she wanted to use horror because it could deal with a social subject without turning the film into a naturalistic drama.
The Body Horror Was Built From the Ground Up
Pierre-Olivier Persin, who worked on the makeup effects for The Substance, handled the special-effects makeup on Mutation, but the approach wasn't simply to copy the more extravagant mutations from that movie.
Le Corroller and Persin spent a long time researching skin diseases, medical imagery, textures and colors before developing the particular forms Margot's body would take, and Le Corroller has said they wanted details such as veins, blood vessels and pores to make the changes feel convincing rather than like generic monster makeup.
The director also had a very specific idea about how Margot's body should be photographed, because she wanted the camera to get extremely close to the flesh and make the audience feel as though they were looking at something under a microscope.
The cinematography comes from Guillaume Schiffman, while Anne-Sophie Delseries handled production design and Jérôme Eltabet edited the film - the music is by Rob, whose previous genre work includes Maniac and Revenge - two films Le Corroller specifically mentioned when explaining why she wanted him involved.
From Cannes to FrightFest
The first major stop for Mutation was the 2026 Cannes Film Festival, where it played in the Midnight Screenings section as Le Corroller's first feature, where the film was subsequently shown at festivals including NIFFF, L'Étrange Festival and Tubi FrightFest, giving it a surprisingly strong festival presence before its French theatrical release - the film also closed Tubi FrightFest 2026 under the English title Species
The title situation is slightly messy, which is worth clearing up because you'll see all three names attached to the same movie - Sanguine is the French title, Species is the English international title, and Mutation has also been used for the film in some territories, including Korea.
After its festival run, Mutation is scheduled to open in French cinemas on October 28, 2026, but the film has already been screened internationally, so October isn't its premiere date - it is the start of its French theatrical release.
