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.

Details

Cast

James Lurie

Seth Shostak

Nick Pope

Brian De Toy

Stephen Hawking

Paul Springer

Travis Taylor

Bob Boan

Michael Michaud

Paul Parsons