The film stars Bill Skarsgård, Jessica Rothe, Michelle Dockery, Brett Gelman, Isaiah Mustafa, Yayan Ruhian, Andrew Koji, Sharlto Copley, with Famke Janssen and features the voice of H. Jon Benjamin.

The plot revolves around a campaign of vengeance enacted by a martial arts expert, rendered deaf-mute by an attack that killed his entire family, whose thoughts are presented as an inner voice derived from a childhood video game.

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.

Gideon reveals that the party is a scripted ruse orchestrated to trap anyone who may want Hilda dead, and Boy is subsequently captured by June 27 after a vicious duel.

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.

In a statement, Nthibah CEO Simon Swart said the film would combine "real-world themes with a stylized look that is fresh, cool, and original, borrowing from the best of graphic novels.

[11] In January 2022, Andrew Koji was added to the cast,[12] and Jessica Rothe replaced Samara Weaving, who dropped out of the project due to scheduling conflicts.

[13][14] In March 2022, Famke Janssen, Brett Gelman, Sharlto Copley, Quinn Copeland, twins Cameron and Nicholas Crovetti, and Michelle Dockery were confirmed to star.

[3][4] In the United States and Canada, Boy Kills World was released alongside Unsung Hero and Challengers, and was projected to gross $2–3 million from 1,993 theatres in its opening weekend.

The website's consensus reads: "Bolstered by Bill Skarsgård's all-in performance, Boy Kills World may offer just enough action thrills to offset its thinly written characters and predictable plot.

[22] The Guardian's Catherine Bray gave the film 3/5 stars, writing, "Skarsgård is a treat in the role; the character is deaf and mute, so his performance approaches something of a lethal Buster Keaton...

But it could be, too, that Boy Kills World suffers from the wrong kind of excess, not just in its approach to action but in the design of the plot, which piles one gimmick on top of another.

"[29] Sophie Butcher of Empire wrote, "Despite some fun action excess and an impressively committed performance from Bill Skarsgård, Boy Kills World is a muddled, tiring mess, favouring violent shocks over cohesive storytelling."

A spin-off animated television series of the film based on the in-universe arcade game Super Dragon Punch Force 3, written by Mario Carvalhal and Judd Fitzjohn, is in development as of April 2024.