Doomsday (2008)

Dir. Neil Marshall

When a deadly viral epidemic breaks out in present-day Britain, killing hundreds of thousands of people, the government quarantines the infected behind a walled city -- only to be confronted with a resurgence of the disease 30 years in the future. In the vein of Mad Max and 28 Days Later, this morality tale veiled as a sci-fi hypothetical features enough action, combat and suspense to keep audiences wondering, "What if?"