출연진
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
Leandro DiMonriva
Scientist