Hector (Karra Elejalde) is relaxing on a lawn chair outside of his new country home, surveying the nearby hillside through a pair of binoculars, when he catches sight of what appears to be a nude woman amidst the trees. Hiking up to investigate, he is attacked by a sinister figure whose head is wrapped in a grotesque, pink bandage. Fleeing in terror, he takes refuge in a laboratory atop the hill, where a lone attendant (director Nacho Vigalondo) ushers him in to a peculiar scientific contraption. He emerges what seems to be moments later, only to find that he has traveled back hours in time, setting in motion a brain-twisting, horrifying chain of events when he inadvertently runs into himself.