An 18 year old man living in a Dublin housing estate with his grandfather, is caught holding drugs for his friend's older brother and is sentenced to 3 months in prison.

Primatologist Davis Okoye shares an unshakable bond with George, the extraordinarily intelligent, silverback gorilla who has been in his care since birth. But a rogue genetic experiment mutates this gentle ape into a raging creature of enormous size.

A harmless game of Truth or Dare among friends turns deadly when someone -- or something -- begins to punish those who tell a lie or refuse the dare.