Two men witness an unexplainable event in the sky as a historic solar storm approaches, and they try to survive as a terrifying life form hunts them.

When disc jockey Grant Mazzy reports to his basement radio station in the Canadian town of Pontypool, he thinks it’s just another day at work. But when he hears reports of a virus that turns people into zombies, Mazzy barricades himself in the radio booth and tries to figure out a way to warn his listeners about the virus and its unlikely mode of transmission.