Invasión alienígena

James Lurie Narrator (voice)

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

Michael Michaud Self - Author, Contact with Alien Civilizations

Paul Parsons Self

John Ringo Self - Author, Live Free or Die

Mark Moffett Self - Author: Adventures Among Ants

Dirk Schulze-Makuch Self - Washington State University

Neil Strauss Self - Author, Emergency

Kevin Reeve Self - onPoint Tactical

Quay Terry Self - Gunnery Sergeant, USMC

Bill Brown Self - High Altitude Research Corp.

Elise Cantu Survivor

Carin Chea Laboratory Scientist

Zee Cruise Survivor