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