Skarsgård stars as “Boy” who vows revenge after his family is murdered by Hilda Van Der Koy (Janssen), the deranged matriarch of a corrupt post-apocalyptic dynasty that left the boy orphaned, deaf and voiceless. Driven by his inner voice, one which he co-opted from his favorite childhood video game, Boy trains with a mysterious shaman (Ruhian) to become an instrument of death and is set loose on the eve of the annual culling of dissidents.