Boy Kills World: Bill Skarsgård stars as a man named Boy, who vows revenge after his family is murdered by Hilda Van Der Koy (Famke Janssen), the matriarch of a corrupt, post-apocalyptic dynasty, in an attack that left Boy deaf-mute. After being trained in the martial arts by a mysterious shaman (Yayan Ruhian), Boy and a ragtag resistance group embark upon a campaign of vengeance, his thoughts expressed by an inner voice derived from his favorite video game (provided by H. Jon Benjamin), with which he bickers with the ghost of his dead younger sister.

Cast:
Bill Skarsgård as Boy, a deaf-mute man seeking revenge against the van der Koys. Mohr the director occasionally questioned his decision to make the character a deaf-mute amidst other challenges but ultimately had no regrets and was grateful for the outcome.
Nicolas and Cameron Crovetti as young Boy
H. Jon Benjamin as Boy’s "inner voice"
Jessica Rothe as June 27
Michelle Dockery as Melanie van der Koy
Brett Gelman as Gideon van der Koy
Isaiah Mustafa as Benny, a resistance member
Andrew Koji as Basho, a resistance member
Famke Janssen as Hilda van der Koy, the matriarch of the van der Koy family and Glen's wife.
Sharlto Copley as Glen van der Koy, Hilda's husband.
Yayan Ruhian as a shaman
Quinn Copeland as Mina, Boy's deceased sister.