James Lurie
Narrator (voice)
Overview
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.
Cast
20 people 
Seth Shostak
Self - SETI Institute
Nick Pope
Self - U.K. Ministry of Defense
Brian De Toy
Self - Director of Defense Studies, West Point
Stephen Hawking
Self - Theoretical Physicist (archive footage)
Paul Springer
Self - USAF Air Command and Staff College
Travis Taylor
Self - Physicist & Author
Bob Boan
Self - Co-Author, Alien Invasion: How to Defend Earth
Full Plot (Spoilers)
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