In just five gripping minutes, Sounjata Phojo's ALTERER plunges viewers into a claustrophobic psychological thriller where reality itself becomes suspect. The film follows a woman portrayed by Nabila Ben Youssef as she awakens in a sterile, unfamiliar room with no memory of how she arrived. Alongside her are three other strangers—played by Nora Guerch, Thierry Bellevue, and Éléonore Bélanger—each equally disoriented and desperate for answers. As they search for an exit, they discover a mysterious device that seems capable of altering their very perceptions, leading to growing paranoia and fractured trust among the group. Tensions escalate when a fifth figure, played by Lauren Chatigny, appears with cryptic knowledge of their predicament. The film weaves a tense, atmospheric tone reminiscent of classic mind-bending sci-fi, exploring themes of identity, memory, and manipulation. With its tight runtime and relentless pacing, ALTERER delivers a concentrated dose of suspense, leaving audiences questioning what is real and what has been altered.