This film follows three main characters - Jason, Ben, and Leanne - surviving a zombie outbreak in London. They try to make their way back to the lab where the virus was created to retrieve a vaccine. Along the way, they encounter more zombies but also face the larger threat of bandits who roam the wasteland. After Leanne is bitten and killed by bandits, Ben loses hope until Jason convinces him to continue on to the lab. They eventually reach the lab but Ben is injured and the film ends with a standoff between the group and bandits, revealing an evil scientist who created the outbreak.