In the sci-fi thriller "War of the Worlds," Earthlings fight for survival against alien invaders.
But is an obliterating attack from advanced, space faring armada just fantasy, or could it be a scenario based on hard science?
Find out in Alien Invasion as some of America's top scientific experts come together to explore the effect on mankind that contact with an advanced alien race could have.
In this one-off special learn how astrophysicists, weapon designers, military strategists, biologists and anthropologists are preparing for a real alien invasion and the plan for mankind to fight back.
Thursday 19 December at 1:00PM - National Geographic Channel
Saturday 21 December at 7:00PM - National Geographic Channel
Monday 23 December at 2:00PM - National Geographic Channel
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Strictly necessary and performance