There are strong scenes of threat and horror, when frightened people are threatened and attacked by monstrous aliens with tentacles and sharp fangs. A sustained horror sequence shows a man - who is in the process of being executed by lethal injection - being taken over by an alien parasite, which then goes on a violent rampage. A sequence of flashbacks depicted in undetailed line drawing animation shows a child murdering his family members, threatening a dog with a drill, and being struck by his father and beaten by bullies.

An alien pins a terrified man to a wall and forces a tentacle down his throat. Aliens bite people's heads off, and another person is strangled by tentacles, all without strong visual detail. One man kicks another to the floor and then repeatedly stamps on him below frame, a man’s knees are struck at with a hammer, also below frame, and thumbs are pressed to a man's eyes, but without strong detail. A man briefly dangles from a chain around his neck, and there is an equally brief sequence of suffocation with a plastic bag. Frequent scenes of moderate fantasy action violence include crunchy blows and bloodless impalements during alien battles, in addition to gunfire, fistfights and explosions. There are also infrequent verbal and visual references to a man having been physically abused by his family as a child.