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What if an extra-terrestrial force attacked Earth? What might that look like and how will the people of Earth respond? Consulting a cast of world-renowned scientists, survival experts and defense experts, National Geographic explores this frightening scenario. Experts reveal what could motivate alien invaders to attack Earth, and speculate on how the attack might play out, the strategy alien invaders might use, and the most effective ways for humans to respond.

James Lurie
as Narrator (voice)

Seth Shostak
as Self - SETI Institute

Nick Pope
as Self - U.K. Ministry of Defense
Brian De Toy
as Self - Director of Defense Studies, West Point

Stephen Hawking
as Self - Theoretical Physicist (archive footage)
Paul Springer
as Self - USAF Air Command and Staff College
Travis Taylor
as Self - Physicist & Author

September 12, 2011 · 1h 30m
What if an extra-terrestrial force attacked Earth? What might that look like and how will the people of Earth respond? Consulting a cast of world-renowned scientists, survival experts and defense experts, National Geographic explores this frightening scenario. Experts reveal what could motivate alien invaders to attack Earth, and speculate on how the attack might play out, the strategy alien invaders might use, and the most effective ways for humans to respond.

James Lurie
as Narrator (voice)

Seth Shostak
as Self - SETI Institute

Nick Pope
as Self - U.K. Ministry of Defense
Brian De Toy
as Self - Director of Defense Studies, West Point

Stephen Hawking
as Self - Theoretical Physicist (archive footage)
Paul Springer
as Self - USAF Air Command and Staff College
Travis Taylor
as Self - Physicist & Author