Boy (Bill Skarsgard) is left orphaned, deaf, and voiceless when his family is brutally murdered in front of him. Driven by his inner voice, taken from his favourite childhood video game (the legendary H. Jon Benjamin), Boy escapes to the jungle where he encounters a mysterious shaman (The Raid's Yayan Ruhian) who trains him to become an instrument of death. Seeking revenge Boy embarks on a mission against the corrupt post-apocalyptic dynasty headed by the deranged matriarch Hilda Van Der Koy (Famke Janssen), unleashing carnage, delirious violence and martial arts mayhem on his road to retribution.