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.

Starring:

James Lurie, Seth Shostak, Nick Pope, Brian De Toy, Stephen Hawking, Paul Springer, Travis S. Taylor, Bob Boan, Michael Michaud, Paul Parsons, John Ringo, Mark Moffett, Dirk Schulze-Makuch, Neil Strauss, Kevin Reeve

Genre:

Documentary