Released:
2011-09-12

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.

Director:
Louis C. Tarantino

Runtime:
1h 30min

Genre:
Science Fiction, Fantasy, Documentary

• Cast:
• 
  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)