In the film Extinction, nine years have passed since an infectious disease turned the Earth into an uninhabitable place, full of wild beings and with a disturbed mind, devoid of intellect, something similar to the famous zombies.
Patrick, Jack and Lu have managed to survive in this chaotic world. The first two are adult men, while the third is a girl who has ended up living with them in Harmony, a place no one goes because there is always snow, whatever the time of year.
There the three have found relative tranquility in the world in which they live, but having to live together is making a dent in the two adult men. Something has happened between them and that causes them to distance themselves and to hate each other.
Soon they will have to leave the rancor behind if they want to survive, because the creatures that are everywhere appear in what until now was their quiet corner.