- A fever dream action film that follows Boy, a deaf person with a vibrant imagination. When his family is murdered, he is trained by a mysterious shaman to repress his childish imagination and become an instrument of death.
- Boy, a mayhem machine with a hilarious inner voice, has been trained from childhood by his mentor to assassinate the bloodthirsty Hilda Van Der Koy and avenge his family's murder. Guided by his little sister's mischievous spirit, Boy uncovers one stunning revelation after another as he barrels toward Hilda, leading to a shocking, carnage-crazed finale.—Lionsgate
- Boy, a young child, lives in a dystopian city with his mother and younger sister Mina. Boy and Mina often play arcade games and draw illustrations of their future. The city is ruled by the Van Der Koy family: Gideon, Melanie, Melanie's husband Glen and the head of the family - Hilda. Once a year, Hilda gathers 12 people from the city to participate in The Culling, where all twelve are killed on live television. Hilda gathers Boy, Mina and their mother and shoots Mina and their mother, killing them, but leaves Boy for dead, having made him deaf and mute. An unnamed Shaman finds Boy and nurses him back to health.
Years later, a fully grown Boy continues training with the Shaman in the hopes of exacting revenge and constantly hallucinates Mina. In the city, Boy sees Glen and Gideon arrive to round up the victims for that year's Culling. After being heckled by a woman in the crowd, Glen accidentally shoots a civilian, triggering a massacre at the hands of June 27, the Van Der Koy's enforcer. Boy follows them in the trunk of Gideon's car to a warehouse, where he is attacked by Glen and several of his men. Boy kills the men and befriends a captive named Basho, who he interrogates Glen with. Glen reveals that Hilda hosts a party before The Culling every year and offers to help them, but is killed when Basho accidentally drops a vice he is holding onto Glen's head.
Basho takes Boy to meet the Resistance, but discovers that everybody has been killed by the Van Der Koys except one member named Benny. The three sneak into the manor and Boy makes his way to Hilda's dining room, where he unwittingly decapitates a decoy of Hilda. June 27 fights, defeats and captures Boy. Gideon reveals that he wishes to help Boy; Hilda has created The Culling to protect herself from the Shaman, but has been living in a bunker for years, mindlessly killing innocents even though all of the criminals have been wiped out.
Melanie takes Boy to The Culling and Boy uses a scalpel given to him by Gideon in secret to free himself, reuniting with Basho and Benny. A large battle ensues, during which Benny sacrifices himself to protect Boy and Basho is mortally wounded. Boy executes Melanie and makes his way to Hilda's bunker together with Basho, where Boy is so focused on killing the guards that he misses Basho succumbing to his wounds. Boy discovers Gideon, having been shot by Melanie, who gives him a key card to the elevator down to the bunker. The hallucination of Mina begs Boy not to kill Gideon, but Boy executes him and the hallucination disappears.
In the elevator, Hilda confronts Boy through a camera and microphone. Boy shows Hilda a drawing by Mina, horrifying her into ordering the guards outside to stand down. June 27 takes Boy to Hilda, where Boy sees paintings of the Van Der Koy family, which include him and Mina. Hilda reveals that Boy is her son, and that he actively participated in killing dissidents, including the Shaman's entire family. When Boy refused to shoot the Shaman and fled; the Shaman captured him, mutilated him, and used LSD and psychological torture to warp his mind, making him believe that Hilda killed his family. June 27 is revealed to be Mina, who is still alive.
In shock, Boy cannot give Hilda any signs of affection and she orders June 27/Mina to kill him only for her to stab Hilda in the head with one of her hatchets. Brother and sister battle their way through the remaining guards before being confronted by the Shaman. The three have a lengthy and brutal fight before Boy forces the Shaman's sharpened necklace into the Shaman's neck, killing him. Boy and Mina, both bleeding profusely, exit the bunker. A flashback shows the two playing the arcade game, where the voice announces Player 2 Has Entered the Game.
In the post-credits scene, Boy and Mina are revealed to have survived and are shown eating cereal together.
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